the location of the apartment is awesome. if you want to enjoy madrid's nightlife it is a great apartment. be aware that the apartment is quite loud, there were party's on weekdays. so if you are there to sleep early, it might be not the best place for you.
the host was nice but the communication was not the best. we had no idea how to get the keys until 1 hour before. the apartment could be more clean, there were hair and other crumbles on the floor and the kitchen needs to get cleaned much more. but apart from that, it's a great place to stay