Our stay at Mattia's place was ok and without any significant problems. Having a washing machine was a big help, and we enjoyed being on the south side of the river, away from the crowds.
One sour note that, while not important in the big scheme of things, certainly colored my feelings about the place: despite staying for six nights, we were provided with only two partial roles of toilet paper, and a request for more was refused.
For people who are light sensitive, note that the thin white curtains in the bedroom don't block out the light from the bright street lamps, below. The exterior shutters are angled to block sunlight, from above.