If you’re looking for an unpretentious, authentic, retro bistro experience in Paris, try Le Chartreux, 8, rue des Chartreux in the 6th Arrondissement. I wouldn’t cross Paris specially to come here, but if you’re near the Le Jardin du Luxembourg or around Montparnasse it’s a solid bet. The décor is frozen in the early sixties, with black and white portraits of old stars dotting the walls. The food is simple, but good. I had a pleasant cod with a curry sauce. The prices are all around 15 Euros. In the morning, you might run into Inès de la Fressange having coffee here after dropping her daughter off to school.
Today’s expression, dans le jus (dahn luh sjuh) means “in the juice.” It can mean both to be swamped with work or to be soaked in something, the way fruit can be soaked in a liqueur, par exemple. It can also refer metaphorically to an atmosphere. So, you could say Le Chartreux est dans le jus des années 60 (The Chartreux is steeped in the 60s).