Silvia's place is wonderful! She has a very clean, very well organized apartment. She is incredibly prompt and responsive to any questions or requests you may have. Most importantly for me, she very patiently allowed me to practice my Italian with her, even though as a native speaker, she must have found that difficult! :)
The apartment is in a great location if you like to explore a city by foot. About a km outside of the outer wall, everything is in walking distance as long as you don't mind some exercise. For active guests like us, it was perfect. We also tried public transportation from there and had. O problems with it.
Can't recommend this place enough. The only minor downside is about the neighborhood itself - it perhaps doesn't have quite as many restaurant choices as others. But then again, if you want to live for a few days the way Romans - and not tourists - do, then this is the place for you!