Convenient Madrid location not far from the main train station and other public transport. Close to Museums ( a 10 - 15 min walk) and many other great things to do. Belinda, the host, left materials with great ideas for sightseeing and restaurants. She was good about communicating and made connecting easy.
On the down side, the space is a little cramped, making you less likely to want to just hang out and relax there. But if you don't mind that, there's plenty to do in and around Madrid and it is relatively affordable.