This place is small and comfortable. I felt safe and comfortable the week I stayed there. It is an older building with narrow winding stairs and no elevator. It is a Parisian apartment in a student area, not a hotel. The hot water boiler needs to be turned on whenever hot water is needed--things like that. I was aware of the neighbors, but not disturbed or disrupted by them. If you are looking for a real experience of being in Paris, Nastia's place is a great choice. I had a great week in Paris.
She was unable to meet me when I arrived, but she sent very detailed instructions on how to get into the apartment, where the lights are, etc. so I had no problem.