This is a great apartment for a large group exploring Madrid. The apartment itself is modern, clean, and huge. There was more than enough room for 6 adults to spread out and be comfortable. It's nicely decorated, the kitchen is well-stocked, and the bedrooms are comfortable. There is also strong air conditioning and wifi.
The location is within easy walking distance of many of Madrid's top sights. The neighborhood itself is very interesting and worth exploring: Lots of cafes, restaurants, and cute boutiques. The street out front can get a little loud, BUT all the bedroom windows face the courtyard so we slept soundly.
Overall, we had a great experience.