Excellent apartment. Spotlessly clean. Perfect location; the tube literally 1 minute away, lots of restaurants near by, supermarkets 2 minutes away. The apartment has everything you need: aircon, iron, hairdryer, etc,. (No corkscrew though - issued solved by drinking sangria instead!). The tube is a 10 minute ride into the centre of Madrid. The pool is a great addition; most days we had it to ourselves. Would highly recommend this apartment if staying in Madrid.
The only thing I would change is the mattress. It was very hard but I guess that is personal preference - others may love a firm mattress.