Excellent apartment in a prime location (very close to Plaza Mayor and Plaza Puerto del Sol), with restaurants, shopping, etc. right outside the building entrance. Nice big terrace, but not much of a view.
For luggage that has to be kept on the upper floor of the apartment, it's easier to take it in through the 5th floor door (which can only be opened once inside; key only provided to the 4th floor apartment entrance) rather than up the narrow winding staircase inside the apartment.