Great communication from the host. Excellent location, surrounded by wonderful restaurants, shopping, arts and anything in El Centro (the heart of Madrid) is easily within walking distance. Host even stored our bags while we explored the city on our checkout day for a minimal fee.
Street outside can be a bit noisy, so bring earplugs. Space is clean and stylish but small. Not a lot of "relaxation" room. Great for a place to sleep, shower and get back out to explore all of the awesomeness of Madrid.