If you can stay with Roberto YOU WON'T GO WORNG. The metro is very close to his house. You have Parque del Retiro and La Puerta de Alcalá at a walking distance. I loved it. Plus the neighborhood is at the high roller side of Madrid. Below your room you have all the major fashion brands from Europe, Superdry, Armani, Lacoste, you name it. They all at the Serrano Area where Roberto's apartment is located. And hey, I know if you are using Airbnb is because you are in a budget but you can pretend living the rich life there and go window shopping. Roberto's apartment is well located, clean, safe and quiet. And he is super nice.