This place is great! It is walkable to all the major sights. The Colosseum is 15min away, walking. From there you can pretty much walk everywhere else. If you don't want to walk the metro is less than a minute away. Roma Termini is also like a minute away.
The rooms are spacious, and cleaned everyday. The breakfast is small, but filling. It's basically bread, cereal, and tea/coffee (you have to make it yourself).
The host is the best. We didn't come to Rome until about 11:30pm and she was still up and showing us the map on where to eat/how to get to places. Even before I arrived she gave me detailed instructions on how to get from the train station to the apartment. This is the place you want to stay in Rome.