Having been in Madrid and having used the metro, I was also impressed by how well it works. Seemingly always on time, and very good price service ratio. You can buy "rides" and one ride means get in at any station and get out at any other station of the whole network, interchange as many times as you want. For, at the time, 1.16 Euro. Compare that to Berlin, where you can pay some 4 Euro or so for limited amount of stops or time. Madrid metro >> Berlin public transport.