Overall it's a great pad in a good location. It has some real issues that dropped the score from 5 to 4 and I wouldn't automatically choose it for my next trip to Venice.
Our check-in was good, Martin (agent who met us at the place) was friendly and informative, and the cleaning lady (who we met) was also nice.
That said, it feels like a room rental, not a home, not even a boutique hotel room, and it's really missing the kind of feel you'd get from a place the owner visits - there are no warms touches, the place is feeling a bit used, and having all of the storage in the small bedroom taken up with linens (and some tennis shoes!) made us lose some of the affection. The main bedroom is really nice, the location is good, but the second bedroom is a lost cause - too dull for kids, beds too small for adults, and the storage seems to be used to storage stuff for the owner maybe?