This was our first experience of Air B and B, and it worked out really well. Communication was very good: we got very clear directions to get to the apartment (one easy bus journey from the train station) and then Felipe visited in the evening, gave us useful info about the flat. Location brilliant: we walked everywhere: Colosseum about 25 mins, St Peter's/Vatican 20 mins, Trastevere 20 mins. Couple of supermarkets very close by. The flat was in a nice area and felt very safe.
We did manage to overload the electrics and had to take a trip down the cellar to re-set the fuses but Felipe had warned us about this and it was no big deal, it only happened once.