Catherine is a tremendous host - generous, kind, respectful of privacy, and a resource for museums and activities. She makes a very good apple tart.
The apartment is just a few minutes walk from a Monoprix, a laundromat, and the 6 line Glacière metro stop. If you've forgotten anything, including an electrical converter, there's a good chance Catherine has it available already. Must note the phenomenal water pressure, although for North Americans the bathtub may be a bit Parisian.
Had a lovely stay.