The apartment is comfortable and cozy. It has all the amenities required for longer stays and is situated close to a bus station, to the Vatican and to a lot of restaurants. Our host answered promptly to all our questions. Leo, the person who met us at the apartment, was punctual, friendly and gave us tips for restaurants that served local dishes.
As a small downside, the apartment description states that each of the three bedrooms has its own private bathroom. I expected each of them to be accessible from the corresponding room but one of the bathrooms is situated on the hallway.
All in all, we had a pleasant stay at Serena's apartment and we would heartily recommend it to other travelers.