Thanks Cinzia for a very nice weekend!
The flat is large, cosy, very nice and 100% as advertised. Perfect modern place in an old palace, ideally located in the center of Venice : very close to everything, but also in a more quiet and typical area, surronded with canals and old buildings.
Cinzia was very helpful and organised for the directions and arrival, and even spoke French (she also runs a B&B upstairs, so she is used to these things !).
Only cons: the flat is on the ground floor of the building, right near the canal, so there could be little dampness, especially since we visited in november. The hot water is just enough for 2 people, and there could be some noise of people walking upstairs in the morning because of the B&B. Alltogether, only small things you could expect in an old building, and I wouldn't trade it for a room in a brand new and impersonal hotel.