Absolutely awesome apartment, exactly like on the photos and description, no bad surprise.
The apartment is totally quite, at the 3rd and last floor of an ancient building, with a view over the roofs. The design and furnitures are of great taste and quality.
My host picked me up at the vaporetto stop, and kindly gave me many useful indications.
The location is great: just 1mn walk from the Rialto market and 2mn walk from the Rialto bridge. You can get mostly anywhere in the old city (St Marco, Ghetto, Convention bridge etc.) in a matter of 15mn. There are many bars and restaurants in no more than 200m around.
I totally recommend Alex's apartment, again, no bad surprises, just fun, quality and quitness.