The apartment is well located. It is on a quiet street but close to numerous bars and restaurants with a lively nightlife. It is about a 20 - 25 minute walk to Atocha Station and The Prado. The apartment was clean, spacious, light, airy and very tastefully decorated.
We had two problems: the Internet never worked during our four day stay and the key to the street door of the building got stuck in the lock on the two times we tried it. After the second time (which literally took 20 minutes of jiggling to remove the key) we did not attempt to use it again. Fortunately the door was not locked by the other tenants of the building after we gave up on the key. We tried to reach Javier about these problems by several unanswered phone calls, a couple of text messages and one email. It took 48 hours after our our first phone call before he finally responded by text.
If we had not felt the need to contact him we would have been happy with our stay but it was difficult not being able to reach him.