This might be one of the best place to welcome you in Madrid.
You will enjoy this well located apartment; this is close to a metro satiation which can take you to the city center in less than 20 minutes. Plus, the flat is clean and well equipped for a long stay (I stayed there 5 days).
The host is very welcoming and will make you sure you have a great time in Madrid.
This is definitely a recommandable place.