It was a great stay. The apartment, the location and communication were excellent.
We did in fact not really need air conditioner, and we visited Madrid while record-high temperatures.
Self check-in was super easy and convenient.
Note that the bathroom is located downstairs. It wasn't an issue for us, but I wouldn't recommend it for people with mobility issues. It could also have used more thorough cleaning. I'm sure that will get improved. Other than that, everything outstanding and I would recommend it.