Right next to the "Re di Roma" ("Kings of Rome") subway station which is 4 stops from Rome Termini. There are buses also from Colosseum and from other places in town that stop right outside nearby a 200 meters walk. (not easy to figure out how to buy a bus ticket though so I guess it might just be "fine" to not pay for that bus ticket). Walking from the colosseum is a 15-20 minute affair can be done just follow your smart map. This flat is very "compact" but it's got everything one needs, the bed is comfortable with a window for fresh air from the backyard area of that place, doors to shower are compact but works just fine. A super great value flat in Rome and not far from everything. I recommend the Vatican Museum guided tour by night at 33eur per person, amazing and their official guides are extremely pro. Thank you Raphael and Michelangelo.