The good: great location next to the metro. It's in a more residential neighborhood that doesn't have the craziness of touristy Montmartre but is next to it. Interior decoration is fun - lots of plants and art on the walls, walls are painted fun colors and there are neat light fixtures that add a lot of charm. If you like a boho-style feel you're going to like the decor of this place.
The bad: it's not clean and some of the basics of the place need to be fixed. When we walked in, we were greeted by a swarm of fruit flies devouring a half-eaten pastry on the counter. Likewise there was fruit set out that was also attracting flies. Not a great first impression, unfortunately. The shower curtain smelled strongly of mildew and needs to be replaced. There is a drain since it's on the ground floor and that smelled as well, but I'm not sure that can be avoided. The light was out in the bathroom (we were told this the day before we got there), but it's not a very good lighting setup as it is quite dark. We would recommend fixing the light as soon as possible. Speaking of the bathroom, the flusher on the toilet leaked water, so we ran the dehumidifier which seems more like a temporary solution than an actual fix.
With a bit more upkeep this place could really rock. We wanted to love it but the cute decor couldn't overcome the overall lack of cleanliness.