The place is perfect for a short stay (2-3 days) in Rome. Walking distance from the colosseum, metro and small shops. The private street on the back of a police station is very safe, even to leave the car.
HOWEVER, if you insist on perfect cleanliness, don't book this place. The shower was not clean, the kitchen is unorganized and unclean and overall the place was not in perfect condition. It was fine for a short time though I wouldn't recommend a longer stay.