We will definitely stay here again. Not only did everyone have their own room, with their own keys if needed, the space was well equipped and you couldn't beat the quiet courtyard, the fully equipped kitchen, walking distance to the Colosseum, extremely close to public transit, and the nice restaurants and bakery just around the block.
Nestor greeted us, showed us the apartment, explained where restaurants and the supermarket were and time frames for arriving at these and other destinations we were booked to see with a complimentary map - a great help to get our bearings of Rome in general.
This apartment is a dream of dreams. Please if you stay here, please take care of it. You'll want to once you see it anyway.