Welcome to France in a basement! Yes, you might want to come here with a lot of time on your hands, but the food is worth the wait and the atmosphere makes totally up for it. People who like to brag with their French skills will feel completely at home.
To enlarge your horizon on the concept of 'crepe' - you can have the sweet version, sure, but the actual interesting stuff is the one with blue cheese, goat's cheese, fried eggs, chorizo, whatever! Also, all dishes carry the names of famous pop songs. Unchain my heart always gets me on my knees!
If there's really no table available any more, just sit down on the cinema seats and have a pernod while you wait for a space to become vacant.