Le 104 is a cultural center that has, I think, primarily been launched to send good vibes into its slightly rough neighborhood in the 19th district of Paris. But its good vibes radiate much farther than that, even down south to my distant left bank of Paris, making me travel to the other extreme of my city now and then – which proves its attraction.
The center exhibits occasional artworks, includes several shops and cafés, has an organic market on Saturdays, and seems to be the place to be to practice dancing. Whenever I go there, there are always people dancing: hip hop, tango, salsa, you name it. Also, they have yoga/relaxation classes at noon and the occasional freely accessible dancing evening, which attract the most mixed audience I have seen in Paris so far, proving their success in truly reaching out to different audiences.
When I visit during daytime I enjoy wandering around in the second hand shop called Emmaus and a nice book shop just next door. Finally the little café/restaurant in the corner serves coffee for very decent prices and the cakes are excellent.
If you want to be sure to attend an activity while in Paris, you can check the culture programme on their website here.