I was there in december last year for 3 weeks at Christian Tissier Sensei's dojo.
Schedule for their training as below :
I don't speak french and it wasn't a big problem. Classes are conducted in french though. It's walking distance from Château de Vincennes metro station (about 10-15 minutes). You will see a small entrance through an alley way, beside a small restaurant. The signature is not really big, so you have to look carefully. Walk into the alley way and you will see the dojo at the end.
Enjoyed myself tremendously. Hope this helps