Willkommen, Bienvenu, Welcome.
We were in Paris a year ago, and found this website useful (provided you can at least read the days of the week etc in French) www.danse-a-2.com Details are shown for all over France.
We went to Le Caveau de le Huchette (5 Rue de le Huchette - just beside St Michel Metro station). Small and really, really crowded but very atmospheric, with live music at the weekend and full of dancers doing more or less Modern Jive - no space for drops or aerials (in fact, barely room for turns/returns!). Admission a year ago was 60F, and I think it's open most evenings.
I also picked up their leaflet (still got it) advertising a 10 lesson course for 300F (or 500F a couple) "Apprendre a danser le Be-Bop avec SLIM DANCE" . Phone number is 01.42.71.09.09.
It's also worth looking on John Sweeney's Modern Jive Resource Centre at http://www.modernjive.com/ then clicking on "All Organisations by Country/Region/Type" where he gives links to several other dance sites in France and Germany, detailng jive/swing/lindy type dances at various locations.
Hope this helps.
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