The apartment is located in a fairly quiet lane, but not far from a busy tourist area. About 5 minutes walk to the Rialto bridge, and 15 minutes from St Mark's square. There is a water but stop nearby and lots of nice restaurants.
The apartment itself is small, but enough for a few days. The front door is thin, so you can hear everything happening on the street outside. It's a very quiet street, but be aware that if you're a light sleeper, you will be woken a few times by people walking past talking or wheeling suitcases.
The host was great - she gave us some great tips on places to eat.