We stayed here for four nights in June 2011 and had a very enjoyable time. The hotel is located a few kms from Cascais town, and a couple of hundred metres from the sea. There is a busy road at the front of the hotel, which seems to be part of the local cycling and jogging route, given the amount of locals indulging in these pastimes here. Once inside the hotel, the road is not visible nor audible due to the lie of the land and the layout of the hotel. The coastline at the front of the hotel consists entirely of steep and rugged cliffs so it is not possible to access the sea directly here. Still, it makes for a pleasant evening walk.
If you want to go to the beach, then it is necessary to go into Cascais itself. It is rather a long walk, especially with children, so a better option is a taxi (about EUR4 into Cascais from the hotel). There is a local bus passing the front of the hotel into Cascais but nobody seemed sure of the timetable.
The hotel itself was impeccable. The room was clean, spacious and airy. Our room was located in the block away from the main hotel, reception, restaurant, etc. and was very quiet. The view from our balcony was not great- the back yard- but other rooms have a garden view or sea view, for which you need to pay extra. We had dinner here every evening except one and enjoyed our meal each time. I am vegetarian and in this case the choice is somewhat limited but adequate for a short stay. The prices are excellent compared to restaurants of a similar standard in town. The restaurant has lovely views overlooking the Atlantic. What can be better than enjoying a great meal and a bottle of the local red whilst admiring a sunset over the Atlantic! There is even cheesey live music here occasionally.
We really enjoyed relaxing by the pool here. There is a pleasant, leafy garden adjoining the pool area so you can just lounge about here if you don't want to be right next to the pool. There is also a lovely shady area near the garden and pool where they serve drinks and snacks.
The staff in the hotel were enormously friendly and conscientious. No complaints here.
The hotel operates a limousine pick-up service at the airport for which they charged EUR60, one-way. Given that this is about a 60 min drive, that there can be long queues for taxis at the airport, that public transport out to here would be very difficult indeed, I think that this is a good option to take. In fact we had a luxury limousine to ourselves and a wonderful old man driving us, who was more than willing to give us a running commentary on all the sights as we passed by Lisbon on the road out to Cascais.
I can find no criticism of this hotel except that I don't really believe that it deserves five stars. For that you do normally need a bit more than what they offer here.

The official star system for hotels has always been something of an anachronism. It seems to be a system whereby you tot up the number of features regardless of quality. Please be assured there is no way this hotel deserves 5 stars, especially when you consider the generally high standard of hotels in Portugal.
The word that keeps occurring to me is "amateurish" . It is almost as if someone with no experience of running a hotel has decided to do so and thinks a few trendy features is all it takes, eg a nespresso machine.
Any of the shortcomings individually don't seem much but cumulatively they add up to a vastly overpriced poor experience. Some examples : the shower head by the swimming pool being so encrusted with green growth that it is probably a health risk - the tray underneath by the way matches it; the slight smell of drains mentioned by others, remains- at least in my room; Smart leather wastepaper baskets in room cheapened by black plastic sacks; Paper napkins (in a 5 star hotel!!); 9 euros per day if you want wireless Internet - double that if you want a fast connection; Staff friendly but most take little pride in their appearance - not helped by the male uniforms which you would normally find a dentist wearing (what's that about?), 3 star breakfast buffet, no turn down service .... The list goes on and on. Good points - the bed was reasonably comfortable - that's it ...
This hotel should be 3 star and charge accordingly. As a regular visitor to Portugal I can tell you that you can get far better value elsewhere.

My two friends and I recently traveled to Cascais and wanted to treat ourselves to a great boutique hotel. This is fantastic. It feels like a spa-- chill, relaxed. A lovely welcome, friendly staff and well decorated. My only complaint (and honestly, it would probably keep me from coming back) it is the outrageous daily prices they charge for internet. I frequently travel all over the world and in this day free WiFi is a given. We had just come from a 50euro/night guesthouse in Ericeira where it was free. They do have a free 'business center' with one computer, but who wants to wait in a dripping bathing suit while someone finishes up checking their email? The fee is in poor taste for such a lovely hotel.

I have just return with my husband from a week stay at Senhora da Guia and we loved it!
Our transfer from the airport was a great experience, our driver Filipe took us to the most beautiful places in Lisbon and gave us the opportunity to see great sights. Do not miss Saint George Castle and Sintra Pena Castle. Overall the staff team was very kindly and they take service serious.
The italian restaurant, Terrasa is fantastic, great panoramic ocean views and real tasty food with the best prices. Wine selection is interesting, tasted new portuguese wines like Terras de Alter. At lunch time home made flavoured ice teas, tasty salads and cool ambiance at the day loungers by the Ocean water pool (what an experience).The Spa is very personal and we had a great massage for two (Bernardo is the best!).
The rooms are very cosy and comfortable, the wallpaper is beautiful and the bathrooms have a double basin with rainshower.
We will definitely return!!