I stayed here for 5 nights with my Girlfriend and it was our first time using AirBnB.
I can say that we thoroughly enjoyed our stay here. The flat is in an absolutely amazing location and is really central for anything you could want for a trip to Rome.
It's not the biggest flat in the world, however that wasn't a problem for us as we spent most of the time out seeing the sights!
As mentioned in a few of the older reviews, it can be quite noisy in the mornings and in the evenings, with vehicle traffic, as well as people walking by. However I would probably say that this is fairly typical of other apartments in Rome and is not specific to this one in particular! Rome is a noisy and bustling place. You get used to fairly quickly.
We were met at the apartment by the hosts brother who was very patient with us after our delayed flight and after we got a little lost on the back streets.
He was very flexible with us for our checkout time and provided very clear instructions.
If I came back to Rome I would definitely consider staying here again. It was my first time using this service and I did have a number of concerns, these were however were quickly put to rest by the host :)