First of all: Francesca & Claudio are great hosts. Incredibly nice, helping and caring. The communication was easy, they gave us a lot of great tips for really good and authentic restaurants and cafes, we could contact them at any time and they organized a pick-up service for us from and to the airport.
The apartment itself is very nice and has all you need. It is in a perfect location for a city trip - close to a local Italian market and 5 minutes away from the Vatican. You can reach the city center by foot passing all the best sights of rome. The terrace and yard of the apartment are also very nice! It is an older building, so it might be a bit louder and you might need to figure out the warm water (at least we did) but that wasn't a big problem for us.
All in all we had a perfect 3 day stay and would definitely come back :)