The store offers board games, figurines, painting equipement and also hosts game nights every week. The owner is very friendly and can recommend game rather well, though it is preferable to explain to him what sort of games you like/dislike, and why.
There is a fidelity service, essentially for every 10€ spent, 1€ is gained. These can be cumulated to and amount, and spent again on a later purchase. Though common courtesy is not to spend it on a 3€ purchase.
Small store for the french community around Vincennes. They also play Magic every week and you will often find players there.