From the Metro Staff here, I learned about discounts offered to students, Senior Citizens, etc. The Office is located at the Lower Level. I showed them my passport and told them how I plan to use their Metro System. They then took my picture.
I was given a card with my picture on it and loaded with 1 Euro and 20 cents. I used the card for buses and trains, very cheap
indeed!
Stations are clean, trains arrive frequently!
Tip: There are many steps to take up and down the Metro Stations. Take note of this if you're carrying a big luggage!