The company that looks after this flat is very thorough and thinks of everything. We were late to pick up the keys from their office and they called ahead to make sure we were OK (we were, just side tracked by the beautiful sights!).
It was a very clean apartment but a little dated. That didn't bother us at all as we were out all day. The beds were extremely comfortable, which was the most important thing of all for us.
There's a pretty courtyard out the back but there's no access. We had fun spotting its canal entrance archway from the book shop a street behind (climb up the stack of books to get a good view).
The location was great, so close to all the stuff you want to see. We got lost a lot but that's part of the fun of Venice (giffgaff didn't work!).
Before we went I spent a while filling in online forms and entering passport details for all six of our party. However, on arrival they were only expecting two of us. I'd also said in advance that we were a party of three couples. That was the only issue we had and a it's minor one.
Overall, it's fabulous accommodation and I definitely recommend it. :D