Location is great - close to Centquatre and Point Ephémère and from the indian neighbourhood in Gare du Nord, with a few nice and cheap asian restaurants nearby. At walking distance from different metro stations.
Julien was very responsive and answered all our questions in a matter of minutes.
The place is nice but a bit tiny if you want to stay for a longer period of time for more than one person (it's a bit difficult to cook for instance) and overall it could have been a bit tidier.