If you can, STAY HERE!!! First off, Malasaña is the absolute best place to stay in Madrid. Not too crowded, lots of small businesses, make sure you stop at Cafe Han So and order an espresso tonic.
Pilar was an exceptional host, she answered all my questions promptly and kindly. 10/10 would recommend.
The apartment was modern and well appointed. The metal shutters were amazing, and helped us get some sleep when we were jet lagged.