The studio is pretty, well decorated and has a great location (15 min walk from La Puerta de Sol, 5 min from the Museo del Prado, El Reitero, Jardin Botanico) ! It's perfect for a short stay.
However it is quite noisy (Tapas bar just under the appartement and noise from other appartment from 8 am even on Sunday and all day). Also the cleaning could be a little bit better (a towel was left in the closet from previous guests).