The apartment was a great location for our first time to Madrid. A reasonable walk to Plaza Mayor, the palace, Prado, and Park El Retiro.
Martha was extremely helpful and arranging for a taxi to pick us up at the airport and take us to the lockers where we got our keys, and then onto the apartment. The instructions were accurate and easy to follow. The lift is small but adequate. Takes you to the third-floor, and then you need to walk up another flight of stairs, just a warning.
There is a Mercado a block away, which was very convenient. Marta‘s recommendations for restaurants and tapas were very helpful. We especially liked Toga, but you should probably make reservations.
We recommend this stay.