Les bêtises serves coffee from KB roastery, utilizing a Victoria Arduino machine to prepare a range of espresso-based drinks. The menu features an espresso priced at €2.80 and a flat white for €6, alongside homemade syrups, cakes, and cookies. Open six days a week, the café is a laptop-friendly spot with free Wi-Fi and seating available. Found on Rue Oberkampf, it reflects the vibrant character of the 11th arrondissement, known for its rich assortment of independent cafés.