We had a great stay - the apartment has a really nice atmosphere, was very clean and has good beds and lots of space for two of us. We went everywhere on the metro which is only a few minutes walk away, as is a 24 hour supermarket - very handy. The museums (Thyssen, Prado, Reina Sofia) are also all within reasonable walking distance. A great place to explore Madrid from, and to come back to after a day's sight seeing.