The metro system in Madrid is brilliant and it is easy to travel around, change lines and get to your final destination. It is worth taking care of your valuables everywhere in Madrid, especially on the metro, as there are quite a lot of pickpockets around. If you are thinking about picking a hotel all locations not to far away from Sol (Puerta del Sol) can be classified as hotels with good location.
Madrid Metro Map
A bigger version of the map can also be found at the homepage of Metro de Madrid. Click here to open the Metro Map pdf. file.