Very responsive host (Roberta) and local contact (Alessandro), beautifully designed apartment, amazing rooftop terrace, great location for accessing all of Rome's sights. Both AC units worked very well, as did both bathrooms. Quiet location despite being around the corner from busy restaurants and bars.
Some advice about how to stay cool if you are staying in the heat of summer as we did -- close and latch the exterior shutters, all windows, and any blinds -- and do it early in the day! This helped reduce inside temperatures a lot and made it easier for the AC to cool quickly once we got back. Use the fans! And look for the plastic ice tray - the freezer was great and we could freeze new ice every few hours.