I met two of the hosts, Masa and Claudio, who are both very friendly and explained everything I needed to know.
Prime location - only about 10 minutes from the train station, 2 minutes to the nearest vaporetto stop.
The single room is small, without a view, but the two doubles are spacious and have a view of a green courtyard.
The big disadvantage is that you may have to share bathroom and toilet with 4 other guests; on the other hand the price is low for Venice.
You can use the kitchen, which is well equipped, including tea and coffee, as well as milk, cereal, biscuits for breakfast.
Perfect place if you have to watch your budget!