Our family of four stayed for three nights and it was perfect for us. The location is even better than I expected - it's literally a two minute walk to St. Marks square. There is a Gondoleir "station" outside the window, and my son (11) and I loved watching them from the window anytime we were in the flat. You could hear the accordion and serenades from boats where the tourists bought the "add on."
Sebastiano was very accommodating when we missed our flight into Venice, and quickly adjusted the arrangements so someone could meet us as soon as we arrived. Wonderful stay!