Make sure you have international data/calling so that you can get a hold of this host before you check in. We stayed with this host two different times during our trip, and both check-ins were terrible.
For the first check-in, our flight was delayed, but we made sure to let the host know that we would be arriving an hour later (they responded that the new check-in time would be good and that someone would be there). We braved the cold and rain to get to the apartment location only to wait for a half of an hour outside before we could check in. We sent multiple messages via the AirBnB app to the host with no response. When another person entered the building, we were able to get inside the building. After we got in, we went and knocked on the door of the AirBnB with no response. A while later the check-in guy came out and finally checked us in. No real explanation, just a lot of "I'm sorry"'s from him. We received several messages from the host after we got situated saying that the person that was supposed to check us in was already there, insinuating that it was our fault that we were waiting there for 30 minutes. No apologies from the host, only blame.
Our second check-in went very similar to the first, but thank goodness without the rain and as much cold. Once again, we got to the apartment and waited there for at least 30 minutes before we were checked-in. We felt this was very unprofessional, and the host should figure out a way to prevent this from happening to future guests. If you like waiting around with all of your luggage, then this AirBnB would be okay.
Another thing, the apartment we stayed in smelled like smoke. It says it is a non-smoking room, but we could definitely smell smoke. Hopefully by the time you're considering this AirBnB the smoke smell is gone. The second time around they did switch us to another room because of the smell, which was nice.
In terms of positives, the apartment is pretty close to the Termini station and right next to a metro stop, so it's quite convenient for getting around. Nobody wants to be lugging suitcases across Rome to get to where they're staying.