My friend and I rented bikes from Le Cabanon à Velos in Pornichet. The rental process was easy and efficient. All the men who work there were friendly and helpful. The bikes were in excellent condition and the price was very reasonable. They don't charge extra for helmet, lock, pannier, or cell phone holder. We rented the bikes for a half day but we got back to Pornichet later than expected, but they didn't charge us for the full day. Truly the best bike rental experience. Highly recommend.