We have just returned from a great 4 night trip staying at Angelo's apartment.
The apartment is perfectly placed and all the major sites are in walking distance (Vatican 30 min, colosseum 20 min, Trevi Fountain 20 min). The area around the apartment has a great vibe day and night with lots of fantastic restaurants. We went to one of Angelo's recommended places and the food was so delicious we went back the following night.
The apartment (and surrounding area) are secure and safe.
Everything was spotlessly clean and looked exactly like the pictures. We really enjoyed staying somewhere more authentic than a chain hotel and it was far better value for money.
Angelo kept in touch from the moment I booked the apartment and was on hand to answer any questions.
My only tip would be that the apartment has three pin style Italian plugs as opposed to the typical EU style twin pin plugs so I would recommend looking for a suitable adapter! If we return to Rome at some point we would definitely think about staying here again.