Pedro's house is one of the best houses during my trip. He answers my questions promptly when I had troubles. The house doesn't have air-con but it is not hot or muggy even when it's August (you have a fan). The house is situated in the cultural neighbourhood Embajadores/Lavapiés, where lots of graffitis and bars on the streets, just 15 minutes walking to Atocha train station. Highly recommended when staying in Madrid!