Madrid has an extensive metro system, the most convenient and efficient way to navigate the city. A single metro ticket costs €1.50 or buy a 10-trip travel card for €12.20. If you choose to use taxis or ride-sharing services, expect to pay €0.95-1.20/km. A taxi from the airport to the city center costs approximately €30-40 and takes 20-30 minutes.
If you have more time, visit the Reina Sofia Museum, displaying Spanish art since the 20th century, or the Casa de Campo, Madrid's largest park. If you have less time, skip Museo Nacional Thyssen-Bornemisza or Mercado de San Miguel. Avoid eating at touristy spots, instead head to Tapas bars with locals for a more authentic experience.