Ariel's place is conveniently located in the heart of Madrid. You can walk to most of the major sites but if you ever need to take the metro, two different stations are within 2 minutes walking distance. His place was clean and spacious and I felt safe walking around at night. Ariel was welcoming and kind and always willing to help. I would love to stay at his place again when I'm in Madrid. I recommened his place to all travelers, but especially to solo female travelers!