tl;dr - One of the best BnB's you can book at this price in Paris. You cant go wrong with this.
The location - Very conveniently connected to almost anywhere you'd want to go in Paris (Tram+Metro at Balard). Everything you'll need in your day to day life, you'll find right outside the house.
The room - One can't ask for a better room than this. The hosts have taken great care to make sure that the room is comfortable. Plus it has an amazing vinyl collection and books + graphic novel collection that you'll fall in love with.
The hosts - Margaux's communication post the booking was brilliant and prompt. Marion was a great host, and extremely understanding of the checkin and checkout times.