I stayed at Josselin's place for a week. It's a nicely decorated apartment.
The check-in was very easy and the communication was quick and helpful.
It's easy acces from Gare Du Nord to the appartment with metro line 5. There are a lot of supermarkets and restaurants nearby.
I absolutely loved my stay here.
(I do want to note that this place doesn't have any wifi which wasn't really necessary for me but might be for some people.
It's also located on the 5th floor with no elevator so if you have big suitcases to cary this may be a bit tricky.)
Overall I'm very satisfied with my stay and I definitely can recommend the place.