This is an absolutely incredible Airbnb. Although we did not meet face to face, Cristina was one of the kindest, most understanding, and most helpful Airbnb hosts I've interacted with. The apartment itself is very clean, chic, and well-stocked with essentials such as glassware, soap, detergent, etc. There are highly effective black-out blinds in the bedroom, so sleeping in isn't an issue.
While there is not direct access to the key tourist attractions (Basilica San Marco, Rialto Bridge, etc.) these locations are easily accessible via water taxi and/or within walking distance if you don't mind walking for about 20 minutes (roughly a kilometer.) The neighborhood itself is quiet, comfortable, and full of charm -- Castello is by far the greenest and most lush neighborhood in Venice.
I'd highly recommend this Airbnb to anyone looking for an authentic Venetian experience that you simply cannot find at a hotel :)