Walk out to the right from your hotel along Alberto Aguilera Street (four blocks) and enter the subway at Argüelles (Line 6 or grey line) to "Ciudad Universitaria", then follow the blue line of the map OR walk further along to "Calle de la Princesa" (to your left coming from the hotel) to Moncloa square and catch bus 82 (to the mathematics stop). On september 1st, 2nd and 3rd you can also catch the university line, "G" that is somewhat faster.
