Marcella was great and a very good communicant. She was kind enough to arrange transportation from and to the airport for us, and was very accommodating with my last minute flight issues!
The place was great. It's a very good location, very central, with lots of good places to eat within a 5 minute walk distance. The street itself has a wine bar and several restaurants right in front of the door. It can get a bit noisy with all the people chatting in the street in the evening but this did not prevent us from sleeping at all (mostly stops around 2am anyway).
Very central place to visit the Vatican, trevi fountain, Trastevere, Coliseum.
The apartment itself is well equipped and quite nicely decorated. Bathroom was clean. Kitchen was very functional and very handy to cook your own pasta bought from the market :)
Anyway, I highly recommend this place!