The location was very nice, close to the Valle Aurelia metro station. Personally I would recommend, if your luggage allows, to take a bus from the Airport to Termini station and then take the metro from there. There are a lot of small caffes nearby with friendly staff (we felt really welcome at Fever Food).
The staff at the AirBnB was really helpful, kept in touch with us and provided lots of useful information.
The room was clean, equipped with an AC unit, a TV set, fast WiFi and a mini fridge. One big pro were the metal blinds at the window, perfect if you want to sleep in. The main downside about the room is the narrow bathroom, but it wasn't such a deal breaker.
One thing that made me worry (this being the first AirBnB I have ever booked) was that I couldn't reach the host when I arrived (not through the phone number provided, nor through the app). After asking around I found the property (situated at the 1st floor), but one of the employees didn't even know we were supposed to arrive.
Last thing set aside, it was a good experience.