This flea market is massive. We spent about two hours wandering around and was able to walk…read morethrough 80% of it while stopping at a few stalls.
Things I thought were interesting -
20 Euro leather jackets
Piles of clothes on tables labeled with different prices (2/5/10 Euros) where customers dig through trying to find treasures
Incense stands
Plenty of interesting wall art
What you will not find at this flea market -
Food or drinks
A restroom if your kid has to go potty
They also have the normal jewelry, clothing accessories (scarves, hats, belts, bags), and little toys that you would find at any flea market.
One stand sold different prints on pieces of wood for wall art. They had movies, anime, Madrid, art, food, and some other categories. At first, I scoffed at the price (1 for 6 Euros, 3 for 15, 7 for 30), but we wound up getting a few as I thought they were well done.
They open at 9 and we got there around 10. That was pretty reasonable, in terms of people. By the time we left around noon, it was wall to wall people, and not a place I would want to be.