The only complaint I had was that in general Pisa is pretty noisy (church bells, street conversations, piazza music). Walls are very thin and we could hear everything our neighbors were doing. If you wake up before your neighbors, everything is great. Otherwise you are guaranteed to wake up when you neighbors start roaming around.
Location is great, only a few steps from the main street. Hosts were great, very nice and accommodating. There is also a nice courtyard outside the rooms.
The room itself is fine and sufficient. Washer in the apartment is a pleasant surprise, although the drying part doesn't work. There is a sufficient kitchen that we used minimally.