I have stayed here previously on business and chose it for my wife's birthday trip to Venice for that reason. We booked a Junior Suite via bookings.com at a really great rate and then were upgraded on arrival. The staff are ALL very courteous and friendly and make you feel very welcome. It is not a big hotel and is better for that. The room we had was spacious but not ostentatious and modestly decorated. We sleep better and for longer than we can recall for some time due in part to the comfortable room and the utter peace that is Venice at night.
My only gripe was with the electronic key and lock which was one of the least user friendly ones I have come across and it seemed to cause problems for many guests.
The roof top terrace is okay but don't expect it to be spectacular. It does provide a welcome respite after a days walking around the city.More