This was an ideal place to stay in Venice. We have stayed in a fair number of AirBnB places and Carmen's apartment stood out particularly for its artistic and uplifting sense of design. In addition to being comfortable and spacious for the destination, it was just fun and interesting.
The apartment in a historic building in the Castello neighborhood. In case you're worried about proximity to sightseeing, don't be. Venice is very small and it's easy to get around using the water bus system. The Arsenale water bus stop is about a five-minute walk from the apartment, and you can easily walk to St. Mark's square if you want.
We really liked being slightly away from the main tourist areas as even in the shoulder season they were mobbed with people. Castello is beautiful and peaceful with plenty of restaurants and shops. As a bonus, you are very close to the two main sites of the Venice Biennale, the Arsenale Building and the Arsenale Garden. It runs from April to November every other year and is definitely worth checking out if you have any interest in contemporary art.
One thing to note is that there is one bedroom with a door and another sleeping area that is separated from the hallway and living room with curtains. This was fine for us but it's good to note. One of our kids slept in the attic area that has a very, very low ceiling. They liked it fine. Note that the attic sleeping area is up a set of stairs from the main bedroom and has no door, so it's essentially sharing the same space. The layout is a bit eccentric but we had no problem with it.
The kitchen is well-equipped and Carmen made sure we had what we needed to enjoy breakfast on the first day. She was very kind and helpful and we thank her for making her well-appointed apartment available to us.