We had a great time in Venice and this apartment. The location is excellent and within walking distance of 2 main ferry stations and it's a really short walk to the main square and attractions. The stairs do require a better than average level of fitness (there are essentially 3 flights of stairs as there's a full flight up to the main door).
There is some easy maintenance required - there were 3 remote controls, 2 of which didn't actually have batteries in them.
The apartment lacks instructions for anything - the heating must have been on a timer as we noticed how hot it was on our departure day. We had no idea how to turn it off.
Although you are asked to take rubbish away, there's nowhere obvious to put it and warning sign at the main door warning that you'll be fined if you leave it there.
A great apartment which would be wonderful with a little more attention and thought put it in.