Well, even that I didn't met Cristina in person (I arrived later on), I can say that she is a delightful woman. My mate felt charmed with her hospitality, and we also do with the Pannetone (an Italian type of cake), left by her in the kitchen table for our Christmas eve.
The place actually is a bit better than what the pictures show. The neighborhood is not so far from the city centre, in fact we reach it by foot several times -the metro line and some buses took their free days at these holiday! The foot trips took us around 30 minutes, and was worth it to discover the milenarian material history left since thousand of years in almost every corner of the city. It was awesome!.
Rome is an astonishing city that merely needs quite more visits, and for this I would certainly come back to Cristina's place. Our host made us feel very confortable.