Modestino seems to be an airbnb "habitué", that means that unless I didn't meet him personally, he was easy to contact, very friendly and he gave me some incredible tips.
This flat was not available but he found us in an other flat in the same neighbourhood for the same price. Clean, good looking and, above all, great location (piazza santo spirito, boboli, p.zzo pitti, and the "carina" piazza della passera). No kitchen (microwave only) but with all these good restaurants, who wants to cook?
I recommand it, sepcially if you're young and/or have a good sleep.
Ha! we felt a little bit cold (but we were coming from south Italy and it was january; I guess that in summer, it's just perfect).

To sum up: Modestino's place is really ok and I'm sure that he's a guest to have in your own house!