This was my first experience with Air B&B, and I have to say I could not have been happier.
So, first thing, if you are arriving by metro, get off at Gare de L'Est. The map might say Louis Blanc is closer, but it's literally a 3 minute walk from Gare de L'Est.
The apartment is super cozy, it overlooks a small courtyard with maybe another dozen apartments overlooking it, but it is so quiet. We slept with the windows open every night and there was no noise. Ever!
It has a separate bathroom and toilet, a pullout bed and a full kitchen.
Linens, towels, they are all there. Extra pillows and blankets are too.
Paris is a stunning city, and having a place like Sylvain's to stay in makes it even that much more memorable.