Absolutely perfect location - in the very centre, yet in a quiet street. Everything is within a walking distance. The apartment is very spacious, nicely decorated - a real pleasure to stay there and rest after the day of sightseeing. Very clean. Very comfortable bed. And very comfortable cushions - a rarity in airbnb homes :) For older people though the bathroom can be a problem - to take a shower you have to get into the tub which has a rather high wall.
Great communication and hospitality of the hosts. Our short stay in Madrid was truly fantastic.