I stayed at Barbara's place over one month. It was a great stay, the flat is really nice, the private bedroom is comfortable with a pretty big wardrobe. The room is big enough to store all your luggage. The location is not central but very well connected to the city center and to the main tourist attractions. The bus and tram stop is 50 mt away. There is a direct bus to the main train station Termini, and also the train station (Trastevere) to the Fiumicino airport is a few bus/tram stops away. Monteverde is a lively area with bars, restaurants and local markets.
Barbara is a very nice host, she's welcoming and easygoing, she also had a super cute cat. I strongly recommend it for a short, medium stay in the city