Great apartment! The location is great with connections to the airport and the city through the Chamartin and Plaza de Castilla stations - both of which are under 10 minutes walking distance. Furthermore, there are cafés, restaurants, bars, and supermarkets, all under 5 minutes' walking distance from the apartment. There is a small but equipped kitchen and dining area, sofa, TV, big enough cupboard, a cute balcony, and a lovely shower. Pretty much everything we needed for our vacation.
Also, host was very responsive and kind in our communications.