Overall a decent stay in Paris. I'll start with the not-so-good first: the neighborhood gets quite unsafe after dark, and is not recommended for walking alone at night. I got my phone stolen by a group of men practically right in front of the door of the Airbnb coming back from meeting a friend out late one night. Be very vigilant! I also agree with other reviews about the fact that communicating with a management company and not an actual "host" detracts from the Airbnb experience, especially when it came to check-in. We were told it would absolutely not be possible to check in anytime before 3 pm so hung around with our luggage in the neighborhood until then; upon arriving at the apartment, however, the assigned person who was there to let us in and give us the keys mentioned that the apartment had in fact been ready for a while and that he had been trying to contact us directly to see if we couldn't come earlier.
Despite these hiccups, once checked in we were very cozy in what was a well-appointed and stylish space for a short stay in Paris. The apartment was warm and well-heated in December, and the bathroom and shower were particularly nice. Ample space for a family of four. Finally, who can resist the charm of la Butte Montmartre?