Easily one of the better Airbnb's I've ever stayed at. The space was perfect, as shown in the photos.
Within 150m of the Atocha entrance for the metro which can get you almost anywhere, but you can also walk to Sol and Grand Plaza very easily. As other have noted the owner installed a second set of double glass doors and when those are also closed you would be hard pressed to hear anything. I'm a very light sleeper and it was dead silent. Internet was very fast (symmetric 250mbps), kitchen fully furnished with all the dishes and pans you might need, and cloths washer+dryer. Very spacious all around.