Ricardo's place is a four minute walk from La Latina. It's so central that you could walk to all of Madrid's major attractions within about 20 minutes. The flat is exceptionally well decorated.
Ricardo is kind and speaks great English. He prepared a list of things for us to do as it was my first time in Madrid.
In fewer words: wonderful stylish apartment, super central, Sunday market El Rastro on his street, close to fabulous restaurants and bars, and above all excellent value for money.