Ilaria's apartment is really terrific. It is very spacious, sparkling clean and has tons of natural light. Moreover, she graciously stocks it with everything you could need -- coffee, shampoo, shower gel, laundry detergent, etc. Perhaps the best part were the beds. They are a true queen size, come with 4 pillows each, have fresh soft linens, and are SO comfortable! It was the best sleep we've had throughout Europe.
As others mentioned, check-in could be tricky if you don't speak Italian. However, I was able to communicate with Fatima in Spanish which is similar enough to understand each other. She also speaks Portuguese. In any event, just ring the buzzer when you arrive and she will come down to get you. She will show you how to use the elevator and point out where everything is in the apartment. A language barrier need not be an issue.
The neighborhood is cute and within walking distance of many restaurants. But if you intend to visit all the historic sites, the location is not very close. It's about a 25 minute walk to the Vatican or the Pantheon. We spent a lot of money on Uber, but there are buses nearby. Also, it was nice to be away from all the crowds at the end of the day. We had a wonderful stay at Ilaria's place and highly recommend it.