We stayed in a superior room on the 5th floor for 3 nights and it was worth every penny. The hotel is located within 5-10 mins walk from Plaza Mayor and Puerta del Sol and you can easily walk to the major attractions such as the Palacio Real and the three most important museums (Prado, Thyssen and Reina Sofia) as well as the Retiro Park. The surrounding streets and squares are full of life and color and the hotel building itself is amazing.
The room itself was very modern spacious, although it was facing the atrium in the inside of the building so there was not a lot of natural light coming in. The amenities were great and the superior room includes the add-on wellness (mimos) menu, from which one can order special pillows, candles, bath salts and even an iPod dock, books and board games. All included in the room rate.
Breakfast was really good too with a wide range of offerings for all tastes. The hotel's restaurant is a modern tapas bar supevised by a renowned chef, which means that room service is very cool, but the restaurant itself can get rather crowded especially on Friday and Saturday evening.