Ernesto is a nice guy, very polite and helpful. He told us about the Together project involving the house: not just a rental service, but a place for people who travel and share their experiences with other persons.
The apartment is located at the 1st floor of a beautiful building in a really quiet area in Trastevere. Our room was huge and minimal (but in a good way). The rug in the room was a bit dusty and the kitchen a bit messy, but the rest of the premises were clean and hipster-friendly. We shared the bathroom with other guests who didn't clean the shower, obviously it's not Ernesto's fault. Bike rental at 10 Euros a day was the turning point of our vacation: we had the opportunity to see a lot of places without losing time with public transport in the chaotic streets of Rome. Really nice place, highly recommended!