This apartment is one of my top two airbnb places ever. The interior is exactly as the pictures portray - equal to an upscale hotel. The interior is very clean, as are the foyer, lift, and hallway. The kitchen is equipped for cooking (though why would you want to?).
The entrance is right on the Plaza Mayor; however, the apartment itself faces an inner courtyard so you never hear any of the noise of the plaza itself, The location cannot be beat - I walked to the three major museums, the Palacio Real, and other major attractions. There are many restaurants right in the plaza itself, as well as most of the streets leading out of the plaza - lots of tables and chairs out on the plaza and sidewalk.
Mario is the most considerate and caring airbnb host I have experienced. The streets to the plaza were blocked because of an event, and Mario worked with me to have the taxi driver drop me off at another location and he picked me up there. Checking out early in the morning, Mario helped me with my luggage to a major street, flagged down a taxi, and spoke with the taxi driver. He and Noelia immediately responded to my emails and texts before and during my stay.
All in all, one of my best vacations to date.