Atelier 5 is at a great location - only a couple minutes to the nearest water taxi and 15 minutes to the train station and located in a very quiet alley. The kitchen and bathroom are very nice, cozy and clean and you might need to share them with another guest in a smaller room in the apartment (which isn't a bad thing of course - it's always fun to meet fellow travellers). You could cook yourselves a decent meal but we only used it for breakfast, there are too many other delicious places to eat in Venice :)
Masa was very helpful when we arrived on a very hot thursday and we had a wonderful time in Venice!