Sergio's place is truly lovely and a real home to stay in, located right in the centre of Madrid. Almost everything is a reasonable walk away and for anything further out the metro is only 5 mins away. Value for money is excellent, it has everything you could want, though maybe a couple of tiny things could do with a little TLC.
Sergio is also a very accommodating host who was willing to go the extra mile to make the stay perfect and his communication was very punctual.
Would stay again in a heartbeat and recommend to anyone looking for reasonably priced, comfortable accommodation.