The good things about this property are the flat itself and the location (if you want somewhere a little quieter). It's absolutely charming, spacious, and light. The bed was cosy and large, and the rest of the flat was extremely well-equipped and clean. I very much enjoyed staying here and would do so again.
What I didn't like so much were the hosts. Both people I spoke to during my stay were communicative and kind, it's more the agency as a whole I objected to. In my experience, I prefer to stay away from airbnbs run by agencies for a variety of reasons, almost all of which rang true here. I've lived on and off in Venice for a while, and have stayed in various airbnbs, so I feel confident in my criticism:
1) The information which was sent was unnecessarily long. I would have preferred something more condensed or to be asked by the hosts how much I want to know, since I had to trawl through all of it to find the few relevant bits I needed
2) I was charged to pick up the keys, not too much of a problem in itself, but I would have liked to have been informed of this in advance
3) The front door of the building is very stiff, and it took me a good 20 minutes to get in. Once the trick was figured out, it was fine, but again, would have been good to know (particularly since I got to the flat very late at night)
4) While I leave all properties I stay in clean, and often strip beds out of courtesy, a lot of what I do isn't asked of from guests by the host since they charge a cleaning fee. Agency run airbnb's are an exception. Their cleaning fees tend to be higher, yet they make much higher demands of guests as well. And the present agency was no exception.
5) Rubbish in Venice is usually collected each day, from the front hall of each building. I was surprised to find that I had to clear out all my rubbish, and to take it to the tip while staying at this airbnb. I did contact the agency to ask if the cleaner could take the remainder of the rubbish (since they would presumably have some themselves), and was told no. I was also surprised to learn that rubbish was in fact collected from my building each day, and I could have easily left it in the hallway.
6) Tourist tax: I was told that I would have to give the exact amount since it was unlikely that the agency would have exact change. This seems insane to me (it was 16 euros). In the end I had to leave it on the table, and I hadn't managed to get the exact amount the day before (no one seemed to have change in Venice), so I left 20 euros. If possible, surely allowing payment of tourist tax via PayPal is a logical alternative. Or making sure that change is available.
All in all I would highly recommend the flat. It was charming. My direct contacts were professional, but it was the company in which they work which was difficult to deal with.