Andrea met us, and warmly welcomed us to the apartment, which is easily found in a very quiet corner of Castello, thanks to his thoughtful map. He showed us around the small apartment which was ideal for our needs, and kindly offered us some suggestions for reasonable but authentic places for dinner. The apartment has a nice wet room/shower with slate tiles, and was superclean and tidy, and most importantly, warm and cosy.
There's a good supermarket around the corner, and everything else in Venice is really easy to reach on foot.
We loved staying here and thoroughly recommend it.