The apartment is great and very close to the metro station and the railway station. I would recommend anyone coming from Terminals 1, 2 and 3 to take the metro to the apartment. Although you have to change stations it is quite easy and much closer to the apartment. On the other hand if coming from Terminal 4 one can take the train directly to Atocha Renfe station which is only a few more minutes distance away from the metro.
Javier was even kind enough to let us check in a bit earlier. We found the place sparkling clean and everything was functional. A large shower cubicle and water pressure was perfect. The area is great also, felt safe and central to most destinations.
I would recommend this place to anyone visiting Madrid.