My first experience with AirBNB went smoothly - and Marzia was very gracious. She was flexible with my in/out times and sat me down to give me tips around the area. I even appreciated the books (travel, Tina Fey) on the table and the B&B part at the cafe downstairs.
The room with a separate entrance was perfect for me - clean and cozy.
The only thing I would note was that I could hear the family/kids next door at times, but it gave me a glimpse into the life of a real Roman family. I liked that I stayed near the Vatican and had a not-so-touristy of an experience.