Great apartment for exploring Madrid. Consists of 2 bedrooms, small lounge, kitchen and modern bathroom. Javier's parents were very friendly and helpful when we arrived.
Would probably recommend using public transport to get around (closest Metro station, Legazpi, is 3 mins walk), however we walked everywhere (35-40 mins to the main sights), so this is do-able too.
Apartment was very clean, quiet, and well-stocked with maps and household items such as an iron, washing machine, etc.
Would definitely recommend this as a place to stay for exploring Madrid. There is also a very nice park near the flat (opposite the Plaza Rio 2 mall), lovely to wander through in the evenings.