We stayed in Catherine's apartment for 3 nights and it was great.
When we got to Paris it was really late because our flight was delayed and she stayed until 1am to open the door and show us the room.
The location couldnt be better: in the center and silent.
The room and bathroom were very clean, gave us the feeling of new and comfy.
I really recommend you to stay in her house if you want to enjoy Paris to the fullest.