We had a great time at Plaza Mayor! It is everything you could ask for. Great location for tourist activities and also local transport options. A short walk to Sol station which is a major train hub and also link to Atocha Renfe.
The apartment has everything you could want, comfy beds, good shower, spacious and light living area and well equipped kitchen. Through the day you get the noise from the Plaza, but at night with the double glazed windows you hear nothing.

I would not hesitate to recommend this apartment for your stay in wonderful Madrid.