I was in the flat for 2 months.
Etienne is a very good person, helpful and kind.
The flat is well equipped and spacious.
The neighborhood has a bad reputation, but in my opinion is not so bad. The flat is also very cose to the gare du nord/ gare de l'est, so is very well connected by metro and bus.
The only very negative note is that I find the flat not well cleaned and I had to do the cleaning by myself: not nice if I consider the price included in the flat for the cleaning.