Communication with Julien was great. He provided recommendations on where to eat, transportation to the apartment, and even allowed us to store our luggage after check out.
The apartment was as described. It can comfortably fit 2 people. It is right by a police station, with a small lift, and the apartment is quiet. Julien explained that there isn't a ton of hot water throughout the day but we didn't run into any issues with that. He was even kind enough to leave us some drinks, fruit, and even a fresh pastry. Nice touch!
I'd recommend Julien's apartment for those looking for a 2.5-3 star-like hotel experience that is centrally located with a host who is really passionate about Paris.