Federico's place is a great location with lots of restaurants and stores nearby, and two blocks from the street car line which goes one way towards central Rome and the other way past the Trastevere train station which has frequent trains to and from FCO. It's also just four blocks from the massive Sunday flea market, between Trastevere Avenue and the Tiber River. His place is dorm-style, with several rooms and a shared bathroom and a small shared kitchen. Both bathroom and kitchen have balconies with a table and chairs for breakfast on the kitchen balcony. The rooms are big, I brought an S&S-frame bicycle in a suitcase and assembled it in my room and took it out every day for riding. And disassembled it in the room, and put it back into the suitcase, when I left! Also, Trastevere Pharmacy on Trastevere Avenue two or three blocks away does rapid Covid testing for 15 euros.