We stayed at the apartment with 2 adults and three children (aged 9-11 years).
The apartment is small but nice and clean, with two double beds and one couch to sleep on (best for 1 person/child).
The apartment does not have airco: it does have fans.
The best thing about this apartment is the location. The location is perfect, only 1-2 minutes walk with the stairs to the Sacre Coeur. A delicious bakery in the street itself.
We had a wonderful stay! The only thing missing in the apartment was an oven.
The courtyard is nice, but some chairs/small table would be nice so you can sit outside.
My husband had one unpleasant experience at the courtyard of the apartment. There appeared to be a (public?) toilet behind the dumpster, he was walking by and suddenly he say a person on the toilet through a hole and the guy started swearing/shouting at him -quite aggressive so he and the children had to leave the courtyard.