Me and my husband stayed at Chiara's place for 4 nights. She was very friendly and reponsive. It was very easy to communicate with her. Also, she has made a facebook page that suggests some good locals restaurants. We tried two of them and they were great.
The neighbourhood of the apartment is not interesting and there is nothing to walk around but it was very close to Trastevere station (5 min walk) and from there you can easily catch one of the trams to touristic locations or the train to the airport and also to Vatican.
The apartment itself was clean enough but there was an odour in the balcony that I assume is coming from the ventilator system of the building. This was making it impossible to keep the balcony door open for getting some fresh air inside.
The pillows were very flat and uncomfortable. We had to fold them.
The other problem was the noise from the other rooms of the apartment. Since, there is another room next door with its own private bathroom and the walls are so thin, every time that the other guests were flushing the toilet in the middle of the night, it was waking us up. Also, when one of the guests does the checkout, a person comes for cleaning between 8 to 10 AM which will make a lot of noise (like vacuum cleaning).
All in all, considering all the negative and positive points, it is fine to stay there but only in the case that the price is lower.
In my opinion the price of this place was high for what it has and what it doesn't (a simple comparison with other whole-place rental cases on Airbnb).