We enjoyed our stay here! We were greeted warmly and communication with the hosts was quick and straightforward. The space is obviously small, but we loved the cozy vibe and it was a comfortable stay with everything that we wanted/needed. The location is perfect; the colosseum is a few minutes walk away and there are many restaurants and shops in walking distance.
The details state that the entrance is not private, but the apartment entrance is directly inside the building entrance so nobody is disturbed by entry/exit and we didn't even see anyone else in the building hall during our 4-day stay.
The only necessary info I would pass on to future guests is that the hot water tank is about half the size of the standard in North America, but 5-10 min showers each were fine for not running out of hot water.
I absolutely recommend the hosts/place, and would gladly stay again.