We had a good time in this small flat! For Paris, this is a really good deal, and a good place to stay for a few nights.
Highlights: Location (very close to bus & metro, short ride to Montmartre or the centre), cleanliness, quiet surroundings (the flat is in a backyard, we didn't hear the street at all and the neighbours were quiet), easy check-in, provision of linen, towels & tea towels etc.
Things to consider: The shower and bed have seen better days, the ventilation is quite loud and cannot be turned off, and we missed some instructions (e.g. we didn't find out how the TV works). Since the flat is on the ground floor, we did not risk leaving the window open at night or while we were away, which made the air stuffy and hot. However, these are no big deals for a few days, so I'd recommend this place to anyone staying for a long weekend or so.