My wife and I stayed with Ernesto and Lina a little over a week. The apartment was a great base for us during our holiday and the location is perfect for exploring Rome on foot. The neighbourhood is quiet at night but close to plenty of restaurants, bars, cafés, and shops. Ernesto and Lina were so nice, communicated very clearly, and gave great recommendations.
Things to keep in mind: if you want an early start the day after a party or event, events sometimes finish after the indicated time, and though a "strict" noise curfew is advertised, it isn't really adhered to on those occasions. This didn't affect our enjoyment of the stay, and we were happy to join the parties and meet people, but I can imagine it's not ideal if you're planning to work here. While it was great to have access to the kitchen, when events/parties are happening, you can't really access or use the kitchen.
We really loved the atmosphere and experience staying here, and would definitely do so again.