Unfortunately there were a few major problems with the apartment when I stayed, and I could not recommend it.
Both times I left the apartment, I was locked out for 5-10 minutes because the key would not work - this was a little stressful! (Probably related, the door handle had fallen off when the host was showing me around - he remarked that it seemed the previous guests had caused some damage, and the soap dispenser bottle was smashed).
The shower hot water did not work, which was very disappointing; I was looking forward to a shower after a long day of travel.
I could not get the bedroom blind to close, which meant sun was streaming into the apartment at 7AM and this woke me. There was also some noise from a nearby police or ambulance depot, but this did not stop me sleeping.
However, if these were fixed then I think this could be a good choice for those looking for a cheap apartment that's a little rough around the edges.
The apartment is like a student share-house, with a large main bedroom, good sized living area with a large couch and a small second bedroom with bunk beds. The apartment is older, but with cool furnishings and with a fully stocked fridge, pantry etc for guest use - really like staying in a friend's home. The host also allowed me to stay until the following afternoon because no one else had booked the following night, which I appreciated.
Although the location is fairly isolated from major tourist attractions, there are buses to Tiburtina station and that has train links to landmarks such as an airport and Termini. The area has a large shopping centre and some bars/clubs, restaurants, etc, although not to the same degree as areas such as Monti or Trastevere; the area is more suburban and a little divey, but I did not feel unsafe walking around late at night.