Our family of four (2 adult children) stayed at Roberto's apartment. Roberto met us when we checked in and took time to explain the apartment, provide local recommendations and also offered to help with transport and reservations. He was a great host and responsive before and during our stay.
The apartment is very nice and like the photos. There are three bedrooms - the third one has its own ensuite and small kitchen. It would be fine for 3 couples sharing the three double beds. The kitchen was well equipped and we had everything we needed.
The local area is very nice and the shops on Via Ottaviano are a very quick walk. We found the coffee at Clementina great in the mornings and Roberto's dinner recommendations were spot on. Ottoviano Metro is 5 minutes away, the Vatican about the same.
A great place to stay.