We had a wonderful stay in Rome, Ketty is a very nice and warm person, and really does everything to organize everything for you perfectly.
The apartment is in a great location, next to Vatican City, close to Piazza Navona and Pantheon, basically you can do everthing on foot if you like walking :).
The roof terrace is a great bonus, starting the day with breakfast in the sun, watching the sun go down over St. Pitter in the evening, the real holiday feeling.
I would really recommend this place to anyone.