A very nice hotel, although quite expensive one. Service at the hotel was very friendly and helpful. Breakfast and dinner at the restaurant All'Oro was extremely good (hey, Michelin star, what can you expect).
There were a couple of negatives though, and they had something to do with the room. We booked an executive suite, and quite frankly, the only thing that reminded executive suite was the complimentary champagne that we were served to our room once getting in. The hard wood floors were pretty worn out, and were actually loose and broken next to the bed. That was fixed by putting a carpet on the floor above the broken floor. The other thing was that the bed was quite bad. The mattress also old, you could feel the springs on your back, as there were no pillow-top mattresses.
If you don't take these couple of negative things into account, the hotel was very nice. The staff was very, very friendly and helpful, both at the reception and the restaurant.
I would definitely recommend this hotel to anyone wanting to enjoy their stay in Rome. Walking distance to the nearest metro station was about 5 minutes, and from there it was convenient to reach both Vatican and the "tourist" area of Rome (Trevi Fountain, Spanish Steps etc)