Highly recommend this appartment for families with 1 or 2 kids who want to enjoy Madrid but also appreciate a nice and quite place to stay. The appartment is close to the airport while the city centre can be easily reached via metro (approx. 30 mins). Walk to the metro from the appartment takes only 3 mins.
The appartment was very clean and offers everything what you will need during a short stay. It also has a balcony with a very nice view of the surrounding mountains. As mentioned the appartment is situated in a quite place and there is also a grocery store, couple of bars/cafeteria (good for having a quick Spanish breakfast!) and a pharmacy nearby.
The host, Carlos, was excellent. Everything that is promised @airbnb was delivered. Communication was perfect and very fast. He was also very helpful with showing us the way and providing help when needed.