Good location to stay in Montmartre. It's located within walking distance (5-20 minutes) of all the metro lines needed to get around in Paris and to-and-from CDG airport. The apartment is well decorated and equipped with all the basic amenities needed for snacking and basic cooking. Laure is very friendly and communicative.
Unfortunately, the apartment was not as clean as one would hope. The sofas and bed had dirt and pet hair on them and the apartment as a whole simply felt a little dusty and dirty. There was definitely a smell of cigarette smoke and I suspect a cat lives in the apartment because, aside from seeing the animal hair, my (cat) allergies were acting up. On the whole, the apartment looked clean from a distance but was not thoroughly cleaned upon closer inspection.
As far as comfort goes, the bed is hard and neither the mattress nor the pillows are particularly comfortable. The water pressure in the shower is very low and note that there's no shower curtain.
Lastly, the listing does not mention that the apartment is up three floors of stairs with no elevator, so please be advised if that will be an issue for you.
On the whole, if you're looking to stay in Montmartre it's an attractive apartment in a good location but with room for improvement.