Esteban G.
I left my luggage there for barely 10 minutes and was charged the full rate, with no warning, grace period, or flexibility. The staff didn't seem to care, and the prices are outrageous for what you get. There's zero transparency or customer service. Madrid has plenty of locker options, so use one of those and save your money. This place will take it without a second thought. 0% recommended, zero stars if I could.

