Marta's flat is superb. It is immaculate, and tastefully and thoughtfully appointed. Everything worked well: air conditioning, washing machine, and so forth. The flat is in a great neighborhood, very close to the Vatican and also right next to the Lepanto metro station. There are a wide array of restaurants and shops nearby, yet the neighborhood is not crowded with tourists as it can be in the city center. But it's close to the center: you can walk to Piazza Navona in 20 minutes.
Marta is the most considerate AirBnb host I've ever met. She grew up in Prati so she knows all the shops, restaurants, and goings on. She provided a list of restaurants, gelaterie, etc. and also helped me find an herbalist. She responded quickly and fully to any question I had.