Mario's apartment in Rome is exactly as the pictures. The apartment is at 15-20 minutes from Termini station. It's not perfect if you want to explore Rome by foot but you can use trams and buses for 1,50€/hour. The public transport network will take you where you want in the historic center. The district around the apartment was very empty around August 15th : some shops were closed and Italians were on holiday. So the apartment was very quiet. Sometimes we heard a neighbor singing an italian song : nothing disturbing, that's part of the charm.
Mario took care of our comfort from the reservation to our leaving. He answered questions by phone/e-mail very quickly. When we arrived at the apartment there were a bottle of Italian wine, fresh towels, Italian restaurants tips, a Rome map and some goods for breakfast.
Even if we spent most of the time outside, we particularly appreciated the air-conditioning for the night. We also used the washing machine and the dishwasher. The only thing is that the slats bed are not fixed to the bed itself and we had some surprises when they fell in the middle of the night. On the other hand the mattress is comfortable.