It is the first store in the large chain Printemps, a sort of large department store, one of the first "grands Magasins" in Paris from the nineteenth century. Now it's still a fashion mecca; It's the leading business for wedding registries, and one of the few department stores that attracts both fashionistas and mere tourists, who just want to see the craziness inside. Today there are 22 other Printemps, which form part of the group Pinault Printemps Redoute. There is even a shop in Tokyo!
The Printemps is on Haussmann Bouvelard, or at the metro stops Lafayette or Havre Caumartin. It's right next to the Galeries Lafayette flagship store, another store of the same style.