This an excellent appartment for a few days in Madrid. Especially for a family with two children that don't necessarily want to share a bed. Location is superb, five minutes away from El Prado and Reina Sofía museums, and 10-15 minutes to all the major sights in central Madrid. Metro Antón Martín is 3 minutes away if you need to take public transportation, and Atocha train station is only 10 minutes away.
The appartment was very well heated (we were there in winter) and spotlessly clean. Shower and kitchen work perfectly. There are many cooking utensils and dishes. Highly recommended