We we're a group of four and really enjoyed our stay in the appartment. Everything was clean upon arrival and the house had an AC that kept it really warm. The beds were comfortable and the kitchen had plenty utensils for cooking and eating. Although we didn't need it, the house also had a washing machine.
Furthermore, the appartment is situated right next to the Metro making it possible to go anywhere in Madrid fast. There's also a Supermarket 3 min away and has pretty all the things you might need.