Julien's apartment is amazing. It is very authentic and stylish. If you are after a designer space with the Parisian charm, this is the place to pick. It's quite spacious and fits four people comfortably (if you are Ok with two double beds). It is very conveniently located within walking distance to two metro stations, and Gare Nord, which makes travel a breeze. The neighbourhood is a bit noisy though. Other than that this apartment is a gem and is the best choice for your stay in Paris.