After staying in an apartment in Venice that advertised air-conditioning but wasn't, we were relieved to find these bedrooms have built-in, effective air-conditioning and are spacious. As someone noted below, the shower is small, but the saved space provides a clothes washer (it didn't work during our visit but Ilaria is staying this week, and I expect she'll get it fixed). The elevator worked perfectly and neighboring apartments are very quiet.
The apartment is very attractively furnished and has an excellent location in Trastevere, within 5 minutes walk to a very hip area of outdoor dining, street musicians, some English menus, etc.
We had only 3 nights in Rome and no complaints.