The apartment was pretty spacious, next to a canal in a typical Venetian house. Old with character.
We visited in December so it was nice the heating was on when we arrived. We never met the host but they gave us very clear instructions on how to enter. The host also prepared us a welcome goodie bag and we also found a very useful enlargement of public transport/waterways. What we thought inconvenient was that we couldn't use several electric appliances at the same time (in practice this meant you had to turn the heater off if you wanted to boil water for tea.)
There was a comfy mattress upstairs, the sofa bed was less comfy but still ok. The apartment is on the ground floor. With the windows open, one could hear some pedestrians but since it is a quiet part of the city, this didn't bother us. It was an approx. 20 min. walk/boat to the San Marco plaza, which we thought was perfect.