I chose Lorenzo's place based on reviews, location - close enough to Piazza, Rialto and vaporetto/Alilaguna stops, and attractive price. I had a very nice stay. The place was just as described, very warm (something we currently struggle in the UK with given the insane heating costs), spotlessly clean. The only noise I could hear was an occasional boat passing on the canal outside. The bed was extremely comfy.
The only thing that disappointed me was the fact that I couldn't open the balcony door (I was told the lock was damaged by a previous guest), however with the weather being rather cold I would not have spent much time there anyway. I also struggled to open a safelock, it worked after a few attempts but the outside part fell out and wouldn't go back in. Best to get there in the day light, there is a gate to open first and another door to get inside the condominium building.