We had an excellent stay Massimiliano’s place. The apartment was well-furnished and comfortable. Although we didn't make full use of them, we appreciated all of the small details, like the fact that the apartment was stocked with plenty of kitchen supplies, living room had a bluetooth speaker, separate A/C units in both the living room and bedrooms, etc. We definitely felt as if we were staying at a friend's house rather than a rental property.
The apartment was very centrally located, no more than 15 minutes walk from any of the major sights and museums. There were lots of restaurants and bars nearby as well. As other reviews have noted, it requires 6 stories of stairs to reach, but the design, comfort, and overall value of the place are well worth the climb.