Silvia's place is really great! Located very close to both the Metro and the Vatican. There are plenty of shops and restaurants nearby. It's a perfect place for a single person wanting to stay and see Rome/the Vatican.
Silvia herself was very kind and considerate during my time there, and was willing to work with my schedule of staying outside of rome a couple of days while I was visiting. She also arranged to have someone else present to let me in to the apartment when I arrived, since she wasn't available.
Positives:
1) Excellent location
2) Nice clean place
3) Shower available
4) Great rate
Cons:
1) The bed is a little hard, and seems like it would be uncomfortable, but I slept very well! Would not recommend for more than one person.