Quite simply - it's everything I wanted out of a quick stay in Paris. We got the room on the 5th floor that comes with a tiny traditional balcony overlooking the street. Yes, the room itself is small and yes, it does get a bit loud outside...BUT - nothing beats waking up early and going to the local boulangerie for the best and freshest baguette you'll ever have, getting a slice of foie gras from a small shop next door, picking up fresh strawberries and orange juice around the corner, and enjoying it all on your own balcony.
Quick points:
Location - super convenient and at the heart of the montmartre. Metro stop is a 5 minute walk, and of course you have a lot of food options. You can also walk to some of the main sights and enjoy the city.
Apartment - it's a hotel, so everything you need is provided. Bed is comfy and shower has good water pressure. There is a manned front desk (during business hours) and they do store the luggage for you. Note that checkout time listed in AirBnB is 12pm, but they were rushing us to be out by 11:30.
Overall: great place to stay in Paris for a few nights.