One of the cosiest internet coffee houses in Madrid can be found on the corner around “Plaza Santa Ana”. La Bolsa de Minutos is located in Espoz y Mina 17, quite directly in the centre of the city. If you want to go there by metro, you should leave at the metro station “Sol”.
Another popular internet cafe in Madrid is Drop and Drag in Augusto Figueroa 7 in the district of Chueca. The Chueca metro station is quite close.
Wireless Fidelity stations are available in most of the hotels. Unfortunately this kind of service is very expensive in Madrid.