If you are looking for the best hostel in the center of Madrid, go to the Hostal Star Madrid. It offers the best quality of a clean room, comfortable bed, soft pillows, a powerful shower, and a strong WiFi connection. It offers great access to public transportation (trains and buses). It is only 300 meters from the Sol (Madrid's zero points) and surrounded by halal restaurants (Turkish and Moslem restaurants). Therefore, it is not a problem for Muslim people to get food there. The staffs are friendly and helpful. They can speak English well.