Because his hospitality is incredible, I've stayed several times at his apartment. Every time I've checked the available schedule at first, when I make a plan to Paris. Sometimes, even I decide/change my plan along the schedule.
This time I stayed there for moving to Paris. Though I had many things to have to solve, he helped me so much. That's because I have a good friendship with him. I really appreciate him.
He knows Paris so much more than your guide books and any informations on the internet. And of course very accurate ones. He will help you so that you can really enjoy this beautiful city.
If his apartment is available, just book it, right now. Or you'll lose a great chance.