Where can I buy bitcoin in Madrid?

Excuse me, I'm interested in purchasing Bitcoin while I'm in Madrid. Could you please provide me with some guidance on where I can safely and securely make this transaction? I've heard about the various options available, but I'm not sure which one is the most reliable. Are there any physical exchanges or ATMs in the city that offer bitcoin? Additionally, what about online platforms? I'm particularly interested in ones that offer competitive exchange rates and fast transaction processing times. Thank you for your help in navigating this new territory.