The apartment is in an old building, and as such it has really narrow halls, creaky stairs, and a very small elevator. The bed is good enough for one person, but rather small for a couple. But all in all, this is a good value for a short stay, where you won't spend much time inside, and the location is simply unbeatable: right between the Puerta del Sol and the Plaza Mayor, and walking distance or a short metro/bus ride from any main atraction in Madrid. They offer airport pick up for 30 euros, which is perfect after a long flight.