CaElena is a fantastic place to stay. In San Marco, a very short walk from the sights, but somehow quiet. We were able to walk to anywhere, including Cannaregio et al, in 20 minutes or less.
The place itself was roomier than I expected and very comfortable for 4 people. Elena had water and some foods waiting. There were several nice touches like this. Opening the blinds and looking out over the canal and the two nearby bridges was another delight.
We had a small issue getting use to the door lock. Allegra was able to assist us immediately (if unfamiliar with this kind of lock like we were, I recommend trying the lock before your hosts leave).
When I return to Venice I hope to stay here again; a true 5 star experience.