Upvote:2
If you want to experience a bit of the "real Paris". Wake up at 6 on Saturday and go to the many "Brocantes" around paris. Start with a coffee and a croissant in the nearby cafe and enjoy. The nicest things are sold in the early hours, which attracts the most colourful parisian to those markets in the early hours. You can find a listing at "evous". Search for "Brocantes et vide-greniers à Paris". Brocantes is French for Flea market and "Vide-greniers" are garage sales.
Upvote:4
There are countless places you could go but the paradox is that looking for the “authentic” side of the city is a very touristy thing to do in itself.
A few ideas nonetheless: