This is a very nice apartment with a few drawbacks. I would recommend staying here but with a few caveats:
1) Location - it's located near the Vatican. If you plan on making multiple trips to the Vatican, it could not be a better place to book. Stay here! However, if your goal is to spend many days in Rome near the Colosseum, Pantheon, Spanish Steps, etc....then this location isn't great. It's about a 40 minute walk from the apartment which doesn't sound THAT bad, but considering your whole day sight seeing is walking, it's pretty tough to add 40 minutes before and after your day just to get to the apartment. We ended up spending 20 euros each way on Ubers for probably 3 of our 4 days.
2) Quirks of the apartment - The bedroom with the nice bathroom is right on the city street, and seemingly uses single pane glass as you could hear every small thing going on down there. The pull out couch in the living room had a similar issue as people wake up to go to work and the sound from the hallway made it very hard to sleep in the living room in the early morning. Lastly, the washing machine worked fine but initially stunk pretty bad. After 1 wash though, it was fine. Keep in mind there isn't a dryer (which is typical in Italy).
Other than that, this was a great apartment. Barbara was always communicative over AirBnB, and her manager Nico met my mom to get us all checked in. The price is also very reasonable for Rome, and one of the reasons we ended up staying outside the city center.