I really don't like writing a bad review, but this was a disappointing experience. There are some serious inaccuracies in the ad's description.
I booked the smaller room for myself, and the larger room for my mother who was visiting Paris for the first time. We are both allergic to cats, but neither ad mentions there is a cat also living in this space.
When we arrived there were dirty dishes in and around the sink, a dirty cleaning rag was left laying on the floor of the bathroom, dirty underwear on the floor in the hallway, and clutter everywhere. This is not a clean and tidy space. We were not provided with soap, shampoo, or hand-towels as advertised. There was only a single small cloth provided for both my mother and I to share. It was not changed during our 5-day stay.
Our biggest problem was the cat littler. The host has placed it in the guest's bathroom next to the toilet. It smelled very bad, and there was often cat littler spilled over the floor. It smelled so bad that more than once I had to hold my nose to use the washroom.
The description also says there is access to a fridge, but very little room (if any) is provided. Also in description is building staff and a door-man, neither of which are present. We were told to pick up our keys at a nearby bar.
The location is as described, in Montmartre, and very close to the Sacre Coeur cathedral and a metro stop. There is a large grocery store nearby, and lots of cafe's and restaurants in the area. We were pleased with the convenient location, but spent as little time as possible in the apartment due to the poor condition of the living space.