Great place in the middle of the center of Madrid. Super close to the beating heart of the city (Sol), a metro stop with two lines and plenty of eating, drinking and shopping options.
The place itself was very well equipped and clean; it looked exactly as advertised on airbnb. Alirio was super friendly and flexible about arrival and leaving times.
In general, we had a better experience than we'd have in a hotel, so you really can't ask for more.