My son and his girlfriend (19,18) were there 5 nights so they share their experiences with you:
The room is really big, 4 people can sleep in it (2 in the bed, 2 in the sleeping couch). Wifi is good. You share the flat with 3 other rooms but that is no problem because of the big kitchen and 2 bathrooms. The quarter is called "san lorenzo" and its full of life. many students live there. Its perfect for young people, a lot of bars are here. We can recommend the "legends pub" 1 minute walk from the flat with good prices and good italian food. 30 metres from the flat there is a supermarket where you can buy cheap food. a big advantage of this flat is, that its next to "termini" the main staion of rome. there you can take the metro, the bus to get back to the airport, or a train to sperlonga, which i would recommend if you stay here longer than a weekend. Sperlonga is a small village at the sea where you can relax.
To put it in a nutshell it's a great room thanks to its favorable position and the lovely host rosanna that will solve every! problem.