We loved our 5-night stay here. Catherine's apartment is unique, authentic, and eclectic. It's not just "a writer's flat". She's the writer, and her books were on the table to thumb through.
Kitchen: it has all the devices you would need, but it is small. We didn't use it, and didn't need to. Great food was all around us.
Bathroom: seated showers were fun and different. The clothes washer is in here. We were happy to use it so that we could pack light. Our clothes air dried fine overnight on the rack.
Living room: we didn't use it except to store our belongings and use the drying rack. We were always out and about in Paris.
Bedroom: comfortable bed and a window that you can either leave open, or black-out.
Other: four stories is only hard the first time when you have your suitcase :) Great WIFI. Catherine was always available and responsive. She even bought a second fan for us when we were concerned it would be very hot at night in July. We didn't end up using it. The nights were surprisingly chilly enough.