Enjoy Madrid in one of the best areas of the city, next to the Paseo de la Castellana and the Real Madrid Stadium. You can join the host and many friendly people at his 3€ Aribnb Experience https://www.airbnb.es/experiences/113640
Incredible views of the entire city and the mountains. Television, Wi-Fi, air conditioning, 24h security concierge, kitchen, bathrooms and bed equipped. Police right below the building.
You can arrive/leave 24h (just coordinate the checkin/checkout, in case there are).