The host is very helpful. Very good at responding quickly and helped me with my taxi to the airport and a late check out. He also provided me with extra towels at my request which was appreciated.
The street is lovely with lots of clothing shops and you're close to the Vatican. The Pantheon and Trevi Fountain are a fare walk (especially in summer) but the price reflects this and I think is fair.
The apartment is modern, clean and bright. There is a lift. However, I had the impression from the photos that it was a little bigger than it was. It was no trouble as I was travelling by myself but I think 4 adults would struggle to stay here (the loft is scaffolding above the kitchen and the only bathroom is off the one bedroom - there is only one small wardrobe).
My only complaint is that the air con in the bedroom could work a little better but Rome was experiencing a heat wave while I was there so perhaps usually it's ok?
I'd recommend the apartment if you want to stay close to the Vatican for a single traveler, a couple or at most , a couple with one or maybe two children.