Paola's place is large, spacious, and clean! Even the bathrooms are spacious. We were two families of 8 and there was plenty of space for us. The kitchen is a bit small but that seems to be common in Italy.
The apartment is less than a 10-minute walk to/from the subway M station CIPRO. It is a bit of a hike from the station to the apartment. Coming out from the subway, there are quite a few steps of stairs without escalator. (We didn't look for an elevator.) If you have large luggage, be ready to carry them up the stairs. Once outside the M station, there are no more steps (like in Venice) until you get to the apartment. There are a few steps getting in then there is an elevator inside.
Paola's sister met us at the apartment. She explained everything very clearly in details plus answer all of our questions. Very nice additional touches including directions to tourist sites, maps, help with wifi connection, etc. We were short of towels and I messaged Paola late in the day. Someone brought new towels to us the next day when we were out. Very quick response and timely communication. Both Paola and her sister were very friendly and welcoming.
Speedy wifi - best and most stable wifi of all the Airbnb's we have stayed in Italy!
Since the apartment is close to M, you can take M to all the interesting places like the Vatican Museums, St. Peter's Basilica, Trevi Fountain, Patheon, the Colesseum, etc.
Overall, we had a very positive experience staying at Paola's Big House.