Cristina's place is absolutely fantastic. Perfect for any traveler. Well located near the Vatican, her place is a great hub for those wanting to see all major sites but do not want to stay with all the tourists. Very easy to walk to the city center (I usually took the bus, which is also very easy). It's also located right next to a pedestrian street lined with cafés, mini markets and anything else you may need. Very clean, welcoming apartment. The best part is the rooftop terrace-I ate pizza dinners up there as the view is just too great to miss.
Cristina is a fantastic host. She is also a tour guide and helped me find/organize my activities. I actually ended up joining her tour of the Colosseum and it was awesome! She is great about letting you be independent, but is also more than willing to chat and answer all questions.
Seriously, do not hesitate to book this place. You'll love it.