This is a great apartment. The Airbnb hosting team is extremely detailed and highly responsive. The apartment was clean and very secure. Note this apartment is 4 flights of stairs up - about 107 steps - so if you have bad feet/knees, that could be a problem. We had no trouble making the journey up/down once a day. The A/C units (3 of them) cool the apartment quickly... it was 35C / 95F outside and we were nice and cool in the apartment.
The walk from the train station to the apartment was very convenient. The distance from the apartment to the Sites, such as the Vatican, are quite a walk from the apartment so strongly recommend taking the Metro. Oneway trips are 1.50Euro There is a nice breakfast spot just outside the metro entrance.
I Highly recommend this Airbnb. Would definitely stay here again.