If you're looking to explore the secret rugged underbelly of Paris, La Mezcalaria (or La Mezcal as it is known by those from Paris) is the place to go! This chilled secret speakeasy is in no way close to the pretentious bars and hotels of the 1st arrondissement, but if you want to meet real Parisiennes, then this is the place to go! Just wonder through the hotel, through the kitchen and to the door at the far end, and watch as it opens to a secret buzz you would never know existed in Paris.
I loved this place, but also ventured over to another speakeasy called La Syndicat, which I would have to say topped it for me... if you only have time to visit one during your stay, pick that one... if you can find it ;P