I really enjoyed my stay at Mercedes' place. It was clean, tidy and very stylish. The check-in and check-out were very flexible. The apartment is located within a walk-able distance from the city centre and very close to the beautiful El Retiro Park. Mercedes was super friendly and helpful, gave me the map of the city (that saved me when my phone battery run out) and recommended the places to visit and eat out. Overall, I'd highly recommend staying at Mercedes' place.