The apartment is 5 minutes away from the main train station in Madrid. The room was big enough, clean and with private bathroom. In the apartment there is a lot of rooms and probably a lot of people staying there at the same time.
We had a small hickup with the check-in, because we wanted to check in at the earliest possible and the host informed it can be only around 19. We wanted to cancel, but it was too late to get the refund for me and the host didn't want to be punished by Airbnb. Finally he could check us like initially planned, which was great.