Excellent location. Easily walkable to all major attractions and from the Atocha train station. The unit is very clean. The host is responsive. Easy check-in. Exceptional value.
A few other reviewers have commented about noise. The unit faces an internal courtyard, which funnels sound down from other units. We stayed for a week. On weeknights it was usually quiet around midnight, later on weekends (2-3am), although we visited during the San Isidro holiday weekend so weekend noise may have continued later than typical. For us, the noise was NOT bothersome. Madrileños tend to stay up late, and we had planned our trip around experiencing the buzzy nighttime atmosphere of the city. For guests who prefer an earlier night, or who want to avoid crowds by seeing sights earlier in the morning, this unit may not be the best fit for your stay.
Bottom-line: Very clean unit in a prime location. Excellent value. Responsive, helpful host. We recommend!