I've stayed 11 days at this place and it has been very pleasant. Caterina was very flexible when my flight was rescheduled, so I arrived at 22h. That was no problem and I got the keys quite quickly.
The apartment itself is larger than I thought and all in all a nice place to stay. The only real downside I encountered was the sound from the street during the night, so if you're sensitive to this: take ear plugs with you. Those scooters make a lot of noise!
At the first day, I had an issue with the hot water. (It was 40°C so I didn't really need it then). When I notified Caterina, she replied very quickly and a plumber came by a few hours later, on a saturday. So a really excellent host in this regard!