Communication with Stefania and her mother was great. Also checking in late on a sunday night was no problem.
I stayed in their apartment for 3 weeks in March. It is very close to the Vatican and San Pietro train station, which makes transportation quite easy.
The apartment is mostly in the basement, facing a normal street, which means, that unless you close the windows and the blinds, you´ll always see people walking by. The windows have diffusion foil on them though, which makes it better.
The apartment has everything you need for a short term stay. Functioning kitchen with some pots and pans and basic cutlery and plates.
I enjoyed my stay, but found it to be a little overpriced compared to other AirBnBs around.