All arrangements about the booking and the follow-up communication went very smoothly. It was easy to upgrade the stay with one more person. The apartment is very clean and large enough for 4-6 people. Gustavo, the person who waits for you to arrive, was perfectly on time and even adjusted his schedule to be at the front door when we messaged him that we would arrive in 30 minutes. The best location you can find right in the downtown of Madrid!