Everything worked out just fine, Ms. Caterina, the owners mother wellcomed us upon arrival giving us useful information about the apartment and the surroundings. It's a small, cousy flat, a bit tight for 4 persons but works fine for a family with two kids. It's extremily central and close to everything, drugstore, "must-sees" and vaporetto. The kitchen is small but useful and well equiped. The comunication with the owner worked very good and we got a very detailed explanation about how to get there by mail long before our arrival and could come in to the apartment before the usual check-in hour.
It's very quiet, you don't hear any noice from outside allthough there were plenty of tourists in this quarter (of course it's 3 minutes from Piazza San Marco!!!). April is high-season in Venice. I do say we had some very nice days in Venezia!