I stayed for 5 nights at this cute apartment that has all the necessary utilities. Marco's father greeted me and checked me in and was very nice. There is a direct metro to city center that takes 25-30 min, a supermarket right outside the apartment and some restaurants at walking distance.
The downsides were that it wasn't very easy to find the place coming from the Trastevere train station even though it's a short walk, but eventually I managed asking people around. There is a dog park right outside that cause a lot of barking at strange hours.
overall very good stay and great host!