I haven't stayed in the Hotel but, at my B&B owner's recommendation where I was staying, I've bought a one day stay to spend at the thermal pool for 60 euros each.
This deal included reserved parking and use of the main pool. Basically the hotel offers two types of stay for the day: one is the cheaper (public) pool at 18 euros, the other is supposedly more upscale version that allows you to stay at the original spring which is upstream and therefore warmer. Now this "better" deal, while allowing you access to your own locker, a towel and a chair in a covered area which is quite far from the pool, won't let you (pretty much) access any of the services around this pool (the chairs or the bar and the restaurant around it). The idea is for you to occupy one of the chairs in the covered area some 80 meters away from the pool and accessible only thru a "metal detector" sort of door (to keep the area separated from the "public" pool). It's worth noting that this door requires use of a magnetic card that we were indeed given (one card for two people) but allows only one person at a time to go thru (!!). The idea that these guys have is that, unless you're an hotel guest, you're supposed to shiver your way inside the pool from a walkway which is again 80 meters long from where you're staying, thru a metal detector kind of door (one at a time) and finally inside the pool thru a rubber curtain (the dirtiest thing I've ever seen, with chunks of mold on it, simply disgusting). Once in, unlike the hotel guests, you'll be denied the use of a chair by the pool, use of the bar or the restaurant, so, after a while, all that you'll be allowed to do is go back thru the mold infested rubber curtain, walk 80 m dripping water in the cold walkway, thru the revolving metal detector door (one at a time), back to your chair in the covered pavilion.
The staff there, while being quick to deny entrance or turn you away if you're not allowed to enter some of the forbidden premises (like the bar), was most uncooperative and won't even let us talk to a supervisor when we tried to have our tickets refunded or changed into a cheaper regular access to the public pool (once we understood the scam).
As a final note in the main pool there's a lot of what looks like dead plants or moss floating (even though this might be a feature of the spring, I don't know, but the effect is not very inviting) and finally the reserved parking is impossible to find (there's no sign and the place looks like a construction site from outside), and it's a 10 minutes walk from the main entrance. Again the staff is utterly uncooperative and doesnt seem to care (whenever asking for directions or informations we were given a few french style "I dont care shrugs").
While the surrounding area is beautiful (the town of Pitigliano was astounding) and features cheap restaurants serving great food and excellent wine and there's plenty of nice hotels to stay in (like ours), we strongly advise everybody to stay away from the "Terme di Saturnia" since even the "public pool" area (at 18 euros a day), although with a working bar and a restaurant by the pool, looked way overcrowded (with lots of kids screaming and running around), the longest queues even to get a cup of coffee and, again, a nonexistant service from the staff.
My final advice is, unless you want to stay at the (what looked like) extremely expensive hotel, not to buy any Thermal pool package, but if you really want to do that, prepare yourself for trip back in time at what might have looked like being in a Bulgarian resort in the soviet-era !!!

I went to Terme di Saturnia with my then friend-girl (we were just friends), she is now my fiancee. I booked this hotel because I saw it on the pages of "Small Luxury Hotels of the World" and it just looked fantastic. I've never been to Italy at the time and I guess that may have some influence on me. We arrived in Rome with our luggage LOST! With no luggage, we drove our rental car and headed off to Terme di Saturnia. I love driving and had wanted to drive an Alfa Romeo 156 but ended up with a Fiat, oh well. I also bought a GPS and was completely relying on it to work in Italy, well, guess what, wrong software and we were on our own with a map. The whole drive took almost 2.5 hours at night with the 2 of us driving in pitch black darkness in the country side with nothing but our head lights. It was nothing short of a MIRACLE that we found the place without missing even one turn! There was something strange while on the way there... what's with all the wondering cats?? The hotel was expecting us and after we checked in, they found out we did not have our luggage, they gave us 2 suites of warm up to tie us over until our luggage arrive (the luggage never came, just when we thought all hope was lost, the luggage showed up in our hotel in Florence, yet another miracle). I awoke the next morning to a beautiful view of the Tuscany country; there was a town perched on top of a near by hill and farms dotted the landscape. I had to rub my eyes in disbelieve in the beauty I had found myself in, it was just amazing. Our room was fantastic, just like the picture in the advertisement, as a matter of fact, I think we stayed in that exact same room! The room was large, clean and up to date. There was also a golf course but it doesn't look like a nice one (I am a single handicapper). The breakfast buffet was fit for royalty. Everything was fresh, healthful, and delicious with plenty of variety. We had to buy our swim wear at the hotel shop (super expensive, but what can we do? my friend-girl's suite was super expensive but super sexy, those Italians sure knows how to design sexy swim suites, she still wears that suite to this day, and she is super sexy!). I read the review that told people to stay away, but I guess when I was there, it was the low season and there was barely anybody there and everything was just wonderful. The natural pool was hot, soothing and , yes, stinky but it did not bother us. We also had a chance to walk around the surrounding country side and visit an abandoned farm house; everything was just wonderful, wonderful, wonderful! We drove to a nearby town, about 30 minutes away to buy some underwear (no luggage, remember?) and I ended up missing my spa session but my friend-girl had hers and she was completely happy with it (the underwear we bought were also super sexy, I guess everything Italian is sexy, and we also still wear them to this day). It is true that there seemed to be no restaurant anywhere in the surrounding area but the hotel restaurants offered us in-room dining since all we had were our warm up suits. Other than the steak (American steaks are just tough to beat), the food was outstanding!

Overall, Terme di Saturnia was not easy to get to but once you are there, you will be amazed at what is offered. I guess with the right frame of mind and going in the low season is also a good thing; we didn't see any kids, just maybe 30 other guests, if that. Also, they don't seem to get a whole lot of Asian visitors; we get curious stares, not unfriendly or unpleasant, but definitely curious. Also, be careful of who you go with, you might also end up with a fiancee like me!

I found this on SPA Finder, and cross referenced with Small Luxury hotels. I filed formal complaints to both. This place is a DUMP. There are busloads of people in the Thermal baths that the hotel has to share with the locals, many of whom are very old or have skin ailments cured by the waters. Lots of screaming children, the place is packed and only separated by a thin wire fence. The pool area has cheap plastic chairs and the sauna is worse than any city gym, its like a small trailer with sticky plastic seats. Treatments are only so-so, and sheets instead of walls ensure that the groaning old person next door going on about his ailments during his treatment can be well heard. Food is dreadful, but perfect for those on a no sodium, low oil diet. There is no decent italian restaurant or cafe within walking distance. Speaking of distance, a very expensive car service from the local train station made for a hellish and very expensive journey from London (plane, two trains and a two hour taxi ride). The hotel is isolated, so apart from sitting and watching the ill get their cure on, there are NO other facilities. No art, just a cheesy "antiquities" store with miniature bronze repros of famous sculptures. Evenings can be spent in cheap plastic chairs listening to Liberace style music, or playing charades in the lounge. If you've never been to a spa, this may all sound appealing but I cannot understand how this place stays open - but of course the older clientele love it; they go every year. Tables of 60yr old+ clients go yearly for the cures. And of course, physically challenged. if you dont fit into either group I would advise you to spend your money elsewhere. ANYWHERE else.

I found this hotel because it was written up in Conde Nast magazine. My travel agent had never heard of it, but booked it for us anyway. My family (husband and 3 girls under 13) were travelling through Tuscany. This was a totally unique and memorable stop for all of us.

The hotel grounds have a simple elegance. Our room was clean, but fairly plain. This might have been because we needed a room for 5 people. I am not complaining in any way. It just wasn't anything special.

The pools were incredible. Quite an experience! (Note that they do not allow children in most of the pools).

The restaurant was excellent and a typical European many-houred affair. So relaxing!!

The staff was totally accomodating, even though we knew very little Italian.

The spa was such an experience. Wonderful!

Don't miss the natural hot springs that are up the road! While it is a little difficult to find, (not the typical American signage) They are amazing. Get there early though, (7 am) as it fills up fast!