Overall our stay with Federico was not great, contrary to most of the reviews we read. The location is sub-par, and if you've never been to Rome "close to the colosseum sounds great, until you get there. Very touristy, some of the lowest rated restaurants in Rome, trash and graffiti everywhere. If we ever stay in Rome again it will not be in that area.
Here are some specifics we were not happy with during our stay with Federico:
1) Check in, Federico sent repeated messages wanting to know if we were there. We understand a host wants to meet people at the door, but it was our first time in Italy, we had no idea how long it was going to take us to get anywhere, and the repeated messages added to the stress.
2) Bugs... the very large cockroaches were the worst, we actually carried one to our next location with us. There were also gnats and ants the entire time. Federico should have the apartment regularly treated by an exterminator.
3) Federico (or associate(s)) entered the airbnb without letting us know ahead of time, while we were gone. The listing said that they usually wouldn't do this, and no other airbnb we have ever stayed has done this. In our opinion occupants should *always* know a host needs to stop in so that they can put stuff away they may not want left out.
4) The mattress was super-firm and we had a difficult time sleeping on it.