Luca's place is a great value. It's a bit small, but if you don't plan on spending too much time in the room it doesn't really matter. He has a Rome travel guide and maps available to make your stay that much better. He was quick to respond to just about every question we had.
We got in late after our flight got delayed and was kind enough to meet us so late in the evening. It's clean and well kept. The AC is a godsend after long day walking around town. It's just a 10-15 minute walk to the Colosseum, Forum, and other sites. Down the street is a cute Gelateria with great tasting gelato. We pretty much walked everywhere and in cases where the distance was a bit far we just took a taxi.
I would definitely stay again.