This is a great spot, 5 minute walk from Metro Valle Aurelia and/or Metro Cipro. It's exactly as described -- your own en-suite room that is just off of the main entrance of the apartment so it feels like it's its own space.
It's absolutely great value for money. Some things to note however are the walls are very thin so you can pretty much hear everything, including Dario and Bibi's young child; as the room facing the interior of the building there isn't much daylight.
Overall a wonderful stay, and recommended if you're on a budget and want to stay near the centre of Roma!