The Casa Trevi is a small, comfortable apartment for 2 about 100 metres from the Trevi fountain and couldn't be better situated for those, like us, who would prefer to explore Rome on foot; we took the bus once, to the Vatican, but walked back. Unfortunately we stayed only 3 nights and wish we had been able to stay the 4 that our very helpful hostess, Marta, prefers. Although in the midst of a very touristy area the apartment is secluded and quiet. It is really a bed-sitter, consisting of one large room divided in two by the fittings of a kitchenette, and a disproportionally large bathroom. The only windows are in the doorway i.e French windows inside the entrance doors. We were there during a cold snap (it hailed heavily one day) so didn't have a problem keeping the room cool at night, but this may not be so easy during the summer. There is no overhead fan.
The area is full of restaurants and small shops selling provisions.
If arriving in Rome at Ciampino airport take a taxi - the fare is regulated at €30.00.
Would we stay again? Definitely.