My girlfriend and me loved our stay with Diego. He was very friendly and extremely hospitable, making us feel completely at home and adding to the overall great experience of Rome.
The room and the whole apartment are very nice and cosy. The location is also great, it is in a residential area (no tourist crowds) with quite a few nice and affordable places to have a meal or enjoy a gelatto. The metro is 3 min away, and the area is well connected with buses. On top of that, you are still within walking distance (15-20 min) of the Colosseum.
We would a 100% recommend Diego's place, and hope to stay there again on our next visit.