The appartment is very small and quite cold at night in winter. However, the location is perfect - close to Montmartre, the city center and the metro station.
If you are only there for a couple of days and only use the appartment to sleep, it's good.
Also, Jean Luc is an amazing host. In case of questions or if you close the door with the keys inside, he does his best to help immediately ;). Many thanks for a great time in Paris!