There's a few secondhand clothes stores in Paris, but always immaculately selected, expensive and fashionable. Guerrisol however is a huge, dirt cheap jumble sale. Stock seems to rotate daily in each of their four stores, and prices fluctuate on the hour. Sifting through endless rails of synthetic jackets at €3 can suddenly reveal a hidden gem.
You enter La Fidelity and will find a very classic Parisian Brasserie, probably almost empty. Maybe one or two people at the bar. In the middle of this place you will find the stairs that go down to the cave. Have fun!