If you have lots of kids or are a poor student or whatever, the place to stay in Rome is here:
Camping Village Roma
Via Aurelia 831
Rome has 3 camping villages, but this one is the best.
It's cheap and nice. The girls that work at the entrance all speak English.
On the map it looks way out, but I've walked it once and it isn't bad. Lots of buses and a giant grocery store across the street.