We stayed here for one night. We were given good directions on how to get to the correct landing, where we were met by Greta. She led us to the apartment, and gave us maps and a quick briefing. The location was great--a couple blocks from St. Marks Square and almost next door to the Hard Rock Café (a good landmark when lost). Luckily, we didn't hear any noise from there.
The only thing I found a little lacking was the comfort of the sofa bed. There were 5 of us, and the two double beds were comfortable, but the sofa bed was not. The apartment was on the 3rd floor, so there were quite a few steps to be negotiated. Also--there were 7 steps between the living area and the bedrooms/bathrooms. I was a little concerned that I might fall down them if I had to visit the bathroom in the middle of the night, so I put a chair in front of them and all was well. There was a great view was down onto a small canal and a gondola area. All in all, I would stay there again.