Myself and a colleague stayed at Paolo's apartment during a recent conference. As these activities took place entirely in the Cannaregio district, this location was an absolutely perfect home base for us. Check-in went smoothly; Paolo's son was kind enough to greet us at the Calatrava Bridge and show us the way to the apartment. There was a bottle of prosecco awaiting us on arrival, which was surely a nice touch.
Beds were comfy and the bathroom fairly modern + clean, but we found the apartment quite noisy overall. The hot water heater in the smaller bedroom would occasionally make strange sounds throughout the night, seemingly for no reason, and the street noise was at times extremely disruptive.
Considering what (even mediocre) hotel rooms go for in Venice, this apartment offered a pretty good value for the money, especially as it has two bedrooms. If you're a light sleeper or otherwise sensitive to noise though, you might want to consider other listings.