Excellent place to stay!
1. Carlos and Xabi are great hosts: they communicate often in advance of your stay to let you know important details.
2. Very quiet apartment - great for getting needed rest.
3. Great location: multiple Metro lines nearby, good markets to stock up on food, and great tapas bars are all just steps away.
4. Very professional check-in: the host was awaiting my arrival, which was very welcome after a long plane ride.
5. Nice "extras" welcoming guests which made for a warm feeling.
6. Everything you could need: full kitchen, washing machine, dish washer, good bathroom.
Carlos and Xabi have a great apartment! It has everything you need: close to Metros to get you to the sights around Madrid, close to bars and restaurants to enjoy the nightlife, and quiet so you can refresh after a long day. In a word: "perfecto."
Thank you Carlos and Xabi.