We thoroughly enjoyed our Carnevale weekend and loved the location! We were only a five minute walk from the Arsenale watertaxi stand and at most 10-15 minutes from San Marco (I was a bit slow due to a knee injury).
There are a minimum of six restaurants within a block or two of the apartment. A fresh bakery is just down the street, the supermarket is just a bit further, and there's a local glass artist almost right across the street!
The only issue we didn't foresee was having five adults and only one bathroom. Also, please know that the twin bed is located in the same bedroom as one of the queen beds. That wasn't very comfortable for our solo traveler (the rest of us were couples). She ended up sleeping on the leather couch instead, which wasn't awful.
Sandro is a good host! We arrived later than expected and it wasn't an issue for him. He showed us around the apartment and explained how things worked when we got there.