What we liked/loved: The space is huge and was perfect for our family of seven (including four kids 18 months to 11 years and grandma). Andrea was very responsive prior to and during our visit. When we requested an additional fan for the fifth room, he was at the door within 15 minutes--first rate service!! Wifi was excellent as well. The apartment was in a nice area close to restaurants and a beautiful square. It's in a nice location, although a bit more laborious to get to when traveling with small children--if it would've been just my wife and I and our packs it would've been a breeze.
What we wished were different: It was very hot when we were in Venice and the apartment got quite hot. The fans were a must, but with no screens on the windows, you have the choice between keeping the windows closed and sweltering or opening the windows to get a breeze and then letting in the mosquitoes. If you're not here in a heat wave then the apartment is near perfect and Andrea is a wonderful host!