Catherine's apartment is lovely and convenient, clean and with modern amenities.
We didn't get to meet Catherine as she was on holidays herself, but a neighbor met us and showed us the ropes.
It was probably a bit larger than we (a couple) needed, only using it for sleeping. Three adults would easily fit.
Metro is really close, and there is lively nightlife (bars and restos) around the corner on Butte aux Cailles.
The wine she left for us was also excellent.