Luis was really helpful and one of the best host I've had during my time in Spain. He sat down with us and showed us on his computer the best places to visit. The location was amazing because everything was walking distance like Retiro Park, Atocha Station, Museo del Prado, Botanical Garden, Reina Sofia Museum, and tons of restaurants.
If you are interested in the nightlife, Luis's apartment is next to the biggest club in Madrid.