I had a pleasant stay with Sabrina's AirBnb. It is close to Trastevere Station and to public transport. You can easily walk into the city center. A supermarket is nearby.
The AirBnb itself is half a floor of an older house transformed into a hostel like accommodation. There are various rooms, a shared bathroom and kitchen. In the kitchen you will find everything necessary.
The interior is old-fashioned but totally sufficient. What I thought was a bit confusing is that at her fotos you see a lot of greenery in a garden like surrounding. But actually you don't have access to it when you stay there.
Nevertheless, I had a great time staying there and would definitely return.