Mario is a great host and his apartment is in a great location, close to the guggenheim museum and lots of the other main parts of the city. There are also lots of interesting shops, restaurants & bars within walking distance so no real need to use the metro system. The apartment is modern and secure and the room was very comfortable. My only issue was that the windows in all of the interior courtyard are covered in metal shutters so you can easily be woken up by his neighbours opening their shutters but there's nothing you can do about that. Mario was very friendly and had good advice about the city. He was also quite to reply to messages, despite working. Overall, I would recommend staying here to others.