Location is the real selling point of this apartment - central, but on a quiet street in a nice area. It's very close to Atocha station and metro (also very handy for the airport shuttle bus), 2mins walk from the Reina Sofia and 10-15mins from the Prado, Park Retiro and Thyssen art museum, and generally just a great base for exploring the city!
The apartment itself, though basic, was cosy and well maintained, with a modern bathroom which was appreciated. Jay stays in the apartment next door which is handy - he was friendly and happy to suggest places worth visiting. It's a good size for lone travellers or a couple.