About the location, like all other posters have pointed out, this hotel is not near Rome city center and also quite a walk away (about 1.5 mi) from the nearest metro station. The free hotel shuttle buses run on a very limited schedule. To/from the metro stations, about 6 to 8 times a day (latest pickup at around 18:45). To/from the airport (Ciampino), only 2 or 3 times a day. If you don't want to use the local buses and only want to rely on the hotel shuttle, you better check before booking if the schedule suits you.
We decided to stay at Hotel Capannelle knowing beforehand that we will use local buses (very cheap, 1 Euro single journey including metro), so we knew what we were in for. A taxi from Ciampino airport to the hotel (only 3-4 mi away) would cost 30 Euro... Unwilling to fork out such a ridiculous sum for a short journey (and the hotel shuttle of no use for our arrival time), we embarked on a public transport journey involving 3 legs and at least 45 minutes: Cotral bus outside of Ciampino airport to Anagnina metro station > metro Anagnina to Cinecitta > bus 654 from Cinecitta to Via Siderno near the hotel. Beware that the local bus only makes a stop when someone presses the button. So, having not yet been to the hotel, of course we wouldn't have a clue when to press the button. With my very limited, cringe-worthy Italian, I asked the driver 'Scusi. Va Hotel Capannelle?' (does this actually mean anything in Italian?) The driver kindly answered with 'Si, si, @#~%*&^#&!' and at our stop signaled for us to get off. Anyhow, my point is that it was certainly manageable and a rather fun adventure, but if you want a straight-forward, hassle-free transfer from Ciampino to Hotel Capannelle, don't use the bus+metro+bus approach.
The hotel itself was decent. I think the star rating means different things in different country. In the UK, one would expect tea & coffee in the room for any 3/4/5 star establishments, but not found in our room at Hotel Capannelle. On the other hand, there was a bidet, a telephone, and an ALARM!! in the bathroom, which are rare features in UK hotels. The ALARM is an innocent looking pull-cord in the shower... Well, at home, we have pull-cord switches in the bathroom for lights, fan heater, etc. So, naturally I pulled on this unlabeled cord in the hotel bathroom wondering what it's for... in the middle of taking a shower, sirens going off in the bedroom, that was frightful yet comical. No firefighters broke into our room to rescue me, so I guess it didn't alarm any hotel staff.
Overall, the room was clean, good size for an European hotel. The breakfast was okay for continental (small selection of hot food - don't expect a real full English). And the staff were generally pleasant. The bottled water in the mini bar fridge was surprisingly reasonably priced at 0.90 Euro. Had one dinner at the restaurant, didn't like the food.
I stayed at a bargain deal, so rating it as 4/5 overall. Had I paid its standard rate, I would've expected a lot more and this hotel would've been only maybe a 3 for me.

Nice hotel with large rooms and very large and comfortable beds. Very helpful staff. Free parking and wifi. Breakfast quite rich with excellent coffee and warm croissants. Sometimes you have to wait 20 minutes to find a table to sit at the breakfast.
The refrigerator and the dryer were not operating normally.
The hotel is far from the city center but very close to the Airport Ciampino. With the shuttle bus takes 10 minutes to the metro station (Coli Albani) and from there to the city center about 20 minutes. The period we went to Rome the shuttle bus was not very often due to the Christmas holidays.
The main reason I chose this hotel was the price.

Capannelle is a great place to base your stay in Rome as far as what a hotel should provide for travelers. Great breakfast choices (I could have taken home the granola they served...so good!), comfortable bed, spacious bathroom and sitting room, pleasant decor and furniture, easy access points to other floors and entrances, restaurant on site (we did not eat there), sofas in the lobby, free WiFi, friendly staff, free parking, and a 5 minute free shuttle ride to Colli Albani Metro stop.

The others that reviewed this hotel regarding its location I agree with. It takes a while and some patience to get to the city center. We took the shuttle once to the Colli Albani Metro stop. More frequently, we used the 664 bus to/from the Arco Di Travortino Metro stop to get ourselves to/from the city. We had to be flexible the first full day of our travels in Rome due to a transit strike. We walked around the area of the hotel, walking along Via Appia Antica (beautiful!) and nearby streets, photographing Villa Quintilli and the aqua ducts, eating at the local restaurants, and trying to mix in with the locals.

I have mixed feelings about staying here again, simply because of the location. Would I pay 30 Euro more per night to stay closer to the city? Maybe. If Capannelle was closer to the city, I would definitely book a room.

First the location, stayed here for 10 nights august 2011, at that time some metro stations were
closed due to works so free shuttle from hotel left you at bus stop at metro station where shuttle buses provided by metro company took you to central train station (termini) This took about 40
mins but was fine,I am sure it is quicker when metro fully operating
we arrived from Fiumacino Da vinci airport which is about 30km used roma cabs who
were excellent with great english speaking drivers well worth the 50 euro and were met at terminal
On couple of occasions got taxi from central Rome cost about 20 euro which was fair
shuttle bus can be busy so make sure you are there 10 mins before departure as odd occasion some people left behind (never happened to us)
Facilities : lpvely covered bar /dining area near pool where you can sit out in fresh air (yet not
get sunburned very relaxing pool is small but fine
Restaurant is nice but limited menu nice sandwiches for lunch staff friendly
nice restaurant il gisrole about 10 mins walk on main road in outdoor garden
Breakfast was excellent and very efficient large choice one of the best i have seen on
Continental europe
Rooms are clean and nice and bright patio doors are locked for some weird reason but not
a issue, only problem we encountered was our room safe which was quite old and after one
day lock jammed, rang reception and after a while said would have to replace safe but in end
were able to open it with some oil and had no problem afterwards staff very nice
wi fi available but did not bring lap top but free internet terminal available at reception on
production of passport not a hassle as was free i do not why people complaining about this
after all most hotels can charge 10 euro a day.
by the way can buy bus /metro tickets at reception 1 euro each for 90mins travel which saves standing in line at metro stations
In general great hotel if do not mind little more travelling to city it was nice to get away from
all the hustle and bustle of Rome Central staff nice great English.