We just got back from a week in Venice for my brother's wedding. The location of the apartment was ideal for the celebrations and tourist sites in the city. Instructions for keys, bins and the tourist tax were clear.
Given the weather was very hot (mid to late twenties) it was disappointing the air conditioning didn't work. So we had to sleep with windows open and all the noise and bugs that come with that! We raised this with the hosts and were told it did in fact work, but there was no help to fix it. Given slow response time they were only available to fix it when we were actually at the wedding! An instruction manual would have been helpful.
Overall, a nice, clean apartment in a great location. But some concerns over the hosting.