Simona is very friendly and nice. She showed me everything in the flat, including how to use a little vintage coffee-maker, and recommended nice cafes and pizza-places around. There is also a super-market not far away.
The flat itself is very nice and clean, just as in the pictures. There is everything you need and you could live here for months. There is a small balcony that faces quiet yard, so it is not loud in the night. Also because I stayed in the summer and there is no AC in the room, Simona gave me a fan. Yes, the room gets hot in the summer, but if you open the window all the night and then close window and blinds during the day, its actually okay. Anyway I guess most people don't stay in the room all day when in Rome. As it is mentioned, there is no elevator, so if you have difficulty climbing stairs it may be a problem.
Location is very central: it is about 5 min from S.Pietro railway station, 5 min to Vatican and 5 min to the bus stop of route 64 that takes you to the centre of Rome. Trastevere and Campo di Fiori are in a walking distance and on the way there you can have a stroll on Tiber embankment.
If I visit Rome again someday I will definitely stay here again!
Thank you Simona!