A great play to stay in Paris. On a quiet non-touristy street with lots of local shops close by. Easily accessible to both Metro and RER stations, so you can get anywhere in the city in 30-45 min. The place itself is quite comfortable... the kitchen has a great induction stove, fridge, dishwasher, washer & dryer. Bathroom has a nice shower, the living room is small but cozy, and the bed is firm and wonderfully supportive (especially if like me you have back pain). And there's a magical view of the Eiffel tower from the balcony!
Only other thing to be aware of: climbing to the loft is through a fairly steep staircase (really somewhere between a ladder and a staircase), and the loft itself has some low ceilings. I.e. if you're over about 5' 6'' you'll probably hit your head a few times before you get the hang of navigating up and down.
Johan was kind and very responsive. I'd certainly recommend this spot for your stay in Paris!