I will try to be fair and honest: the apartment is functional, clean, and pretty well located. A bit dark though, since windows are exposed to the very small patio. But very quiet. Looks like the pictures, no surprise in that sense, price is fair, good value for money. I am fair
But:
The host is not a guy but a company (maybe owned by the guy, but don't expect a personal welcome by the named Melvin, it is a company, running plenty apartments in the center). As a result, same thing as in Barcelona: impersonal apartment, nothing in the kitchen (you have to buy everything, sugar, coffee,...). No book, nothing. The AirBnB spirit is dying, nobody cares... This killed AirBnB in Barcelona, it is going to happen sooner or later in Madrid... It is a business model, it works, but it is everything but nice. You want a proof. The guy who gave the keys went 20 minutes after my call, instead of 5 as he initially told me. But when we had 5 minutes delay while giving back the keys (11:05 on the morning), we were literally thrown out of the apartment. Call it what it is. Business. Definitely far away from the true hospitality from Madrid and Spain in general.