Rosario's apartment met fully our expectations. The apartment is spacious, equipped with all what a family with 2 small kids needs. In the kitchen you can find really everything what you might need for cooking.
Beds are comfortable. Although the apartment is located in a busy area of the city, the apartment is quite, we could sleep really well without any disturbance (okay, we were there in December, so windows were closed).
Our host, Flavio, Rosario's nephew is super kind and easy to communicate with. He is proactive, he arranged an airport transfer for us. He recommended us places to visit, restaurants, pizzerias, gelatos in the neighborhood. When I had questions related to the apartment , he reacted really soon and in a very supportive way.
Definitely I would book this apartment again when I am back in Rome, and I recommend to everyone else.