Frederica´s apartment was very clean, had a nice view and is in a very quiet neighborhood. It´s not the most central apartment, but 5 minutes away from st pietro train station, which brings you everywhere. It´s a 20 minutes walk to the Vatican.
Check-In was great. My plane had a delay and I arrived close to midnight instead of 6 PM. Frederica´s assistent Eva was very flexible and my late Check-In was no problem.