We stayed four nights in this apartment. We requested a transfer from them from the airport to the flat, the driver was already waiting for us, and he drove us right to the apartment for 55 euros, which was reasonable. The lady who was waiting for us at the apt, was very nice and friendly, so the check-in was very smooth, even after our flight was delayed by an hour. Because our flight home was cancelled, we contacted the office, if by any chance we could stay one more night in the apt -- and the guy who answered the phone was really nice, too. So I would say the communication on their behalf is excellent.
The apartment was clean, the beds were comfortable, however, the flat looks better in the pictures. And somehow it had a weird smell, maybe because of the old furniture and wallpaper, but we got used to it.
The one thing, that they are not responsible for are the neighbors: the family, that lives above the flat, are really really loud, we could hear every step, every babycry, every argument. But the next dour neighbor is on another level: every night around 11 pm, they would turn on the tv on max volume -- and they would blast it till 2 am -- if I could speak any italian, I would have understood every conversation on the programme. So after the first night we had to get earplugs.
Other than that, overall, we had a nice stay, the neighborhood is really great, with good bus connections, with a supermarket just in front of the building, and the Vatican is just in a walking distance. Would recommend.