I stayed almost one month in the apartment. Excellent location, 10 minutes walking distance to Coloseum, metro station A only a few steps, Termini also in the walking distance. 2 supermarkets and many restaurants etc. around. Although the building (the entrance gate) is located in quite a busy area, the apartment itself is very quiet because the windows are not turned to the street. I was alone and felt also safe there.
The apartment is really nice, modern, super clean and well equipped.
Sophie is a nice host, she replies quickly and is also very flexible. She even let me check out and leave my luggage in the apartment until the evening.