Catherine's apartment is small, but just right for someone wanting to spend some time exploring the city. It's very near the Metro station, but it's easy (and well worthwhile) to walk into town.
Basically, you'll get a nice room with a comfy single bed, a few hangers in the wardrobe and desk, with access to the bathroom, kitchen and sitting room. It was just fine for me, and would I'm sure suit other solo travellers.
Catherine is warm and friendly, lets you get on with your own thing but is good for a chat,- and she really knows her Paris.