As they say - location, location, location. Love the location this apartment is in. Very accessible to Colon metro station and walkable to another one. Very close to a nice little park - in fact, you can see it from the room. Close to cafes and restaurants.
I would suggest you crack the window open and sleep - will be very nice. Everything worked fine in the apartment - no issues with the fridge, coffee-maker, washer/dryer and stove - which we all used.
Loved the stay here and would heartily recommend it to anyone who wants a nice stay in Madrid.