Sebastiano's sister was a gracious host. She took care of us on arrival. She was incredibly understanding given our lateness and communication issues, and she helped my friend lift a very heavy bag up 3 flights of stairs. She even arranged for a friend to help with the same bag on our departure. It was above and beyond service, and it was very much appreciated.
As for the apartment itself - we only stayed one night but I could have stayed for days. It was beautiful, clean, comfortable, well-located, and well-appointed. The view of San Marco and the canal below was perfect.
I would stay here again in an instant.