We had a very pleasant stay in Madrid. The check in and check out were very easy, the flat was confortable, perfectly clean and above all very well located. It looks exactly the same as it is on pictures and there's enough room for two people. The pool was appreciable in the middle of the hot month of July. But the pool isn't the only thing that makes the housing equipped for hot weather : you also can enjoy air conditioning or just the use of a fan (which was enough for us).
I would recommend it to anyone who wishes to enjoy a stay in the heart of Madrid !