I would recommend this place, the reasons as below.
1. Very good location, San Marco Square is at your door step, 2 mins's walk, you can enjoy dawn and sunset of canal, impressive view.
2. very thoughtful host, Ana's staff kindly provide us with the milk, coffee, yogurts and fruit juice
3. this place is at the top of the old building, with a view from the living room, but you have to be willing to climb 60 steep stairs. for this