This place is a gem! I was in town for a friend's wedding, and also happen to be a writer. Imagine my delight in being able to stay across the street from where the author Cervantes lived! I was close to everything, and walked all over centro Madrid--although it was close to a metro station, too. There was a taxi stand nearby, which made transit to the airport convenient as well. (30 euros)
The apartment itself was quite comfortable, and offered much more than typical at an airbnb: all toiletries, dishwasher, washing machine, and basic food items like olive oil, salt, and pepper. I lived like a Spaniard and would walk downstairs--or take the elevator--and down the street to the grocery store for fresh produce, meat, milk and eggs almost daily. Rotem, the hostess, also had coffee and coffee pots--all kinds! I would most certainly come back and stay here if it is available.