We had an incredible stay! The apartment is wonderful: very spacious, confortable, clean and cool. It's even more spacious that what appears in the pictures.
The fact that it's a basement doesn't bother at all as it has big windows and a patio. It also has a very good light system for the night.
The location is very handy with the subway just across, big shopping mall and other stores in same block.
Alejandro was also very friendly and helped us organise our arrival and departure smoothly.
Everything perfect, would certainly stay here again when I come back to Madrid and would recommend it!