We had a great experience with the host! He is super friendly and helpful and made sure we had everything we needed for our stay including recommendations of the restaurants and places to visit!
The apartment is located in a hip and central neighborhood full of shopping, dining and has a lot of character. We stayed in the off season and it was pretty quiet, however it seems like the apartment is located on a quiet block itself. All the tourist attractions were very close to us - we walked everywhere (Vatican, Coliseum, Roman forum, Thermal baths, Spanish steps etc).
To summarize we had a comfortable, relaxing and safe stay and are happy with our experience.