This was a wonderful stay. The apartment was breathtaking, and the shower was absolutely superb. I have previously stayed in the Puerta del Sol area so knew what to expect in terms of noise and walkability. The windows, especially upstairs, were absolutely amazing and let in a ton of natural light.
The stay logistics were contracted out to a company named Minty Stay. They immediately messaged me on Whats App and were extremely easy to work with. There was a minor issue when a breaker flipped and they were able to walk me through it and fixed it easily
Only negative: the walls are relatively thin, which by and by is not a big deal, but I was treated to several afternoon delight shows by the neighbors. Perhaps this is a positive? :)