I'll start with the positives -- and there are many. The apartment was clean, and felt more spacious than the photos indicated. It's located right off of a piazza with a wide variety of shops and restaurants, yet the apartment was very quiet at night. Five of us stayed in the apartment and found it to be plenty roomy. Also, there was very good accessibility to the vaparetto. The freezer was impossible to open, but that wasn't really a problem.
I'd made an error and was off by an hour with my arrival time, so I own that and do apologize for any inconvenience that caused the folks checking us all in. That said, even up until that point, I generally found their communication to be abrupt. My biggest complaint, though, was that the directions to the apartment were vague at best. A district and number won't point you toward a precise location, and this caused us to need to walk around in circles with all of our luggage. (GPS didn't provide good information.) This could have been easily avoided if they'd provided the name of the piazza or street name. Even when I directly asked what the street name was, I didn't get an answer.
If you plan on staying in this apartment, make sure that you ask for the precise location before setting out. Everything else about the apartment worked out fine.