Had a great stay at Adriana's apartment. Upon arrival (a little late because our train was delayed), a friend of a friend of Adriana (whose name I can't recall) met us at the apartment and thoroughly explained everything about the apartment and the neighborhood. Place is on the 2nd floor, about 30 steps up. There is also a very small elevator.
The apartment was immaculately clean and well stocked with dishes, silverware, etc. Clothes washer worked very well. No dryer but there was a rack outside the kitchen window for hanging small clothing items and many hangers with lots of closet space.
It's located in a mostly residential neighborhood. The only real tourist attraction within easy walking distance is the Vatican museums. Everyplace else might require a bus/train/taxi ride, but the Metro train is just a few blocks away and buses stop right outside. Quite a few restaurants nearby, including the excellent Trattoria Micci. Also multiple supermarkets within an easy walk.
Only minor issue was that there was only an air conditioner in the living room so the bedroom could get pretty warm unless we kept the door open.