My wife and I had an amazing stay in Venice at Pietro's apartment. We loved waking up and eating breakfast looking out on the canal. Since we were a bit off the beaten track, there were far fewer tourists right around us and the area was nice and quiet at night, even on Christmas Day. We were easily in walking distance to all the sites, got our SIMs at the Wind store around the corner and had dinner the first night in the restaurant on the same block. The apartment itself was spacious and clean. Tiziana, Pietro's friend, met us there when we got in, and showed us around the place. All in all, a wonderful place for our stay in Venice!
One last thing: there is a new tourist tax in Venice, as well as other Italian cities, so don't be concerned about needing to pay that in cash outside the Air BnB price.