Overall my experience at this property was great.
Location: It's arguably the best location you can possibly get, even more so than Palermo or Recoleta. This is due to the fact that it's right in the heart of the city, at walking distance from everywhere, but at the same time, it's a quiet and very elegant area (it's no exaggeration saying that it feels like Paris). The street it is on is known for its several private art galleries.
Property: The apartment is very elegant, comfortable and nicely decorated. It was also sparkling clean. The interior of the the unit doesn't get much sunlight but the bedroom, which overlooks the street, does. The AC worked well, which is crucial during the hot summer months in Buenos Aires.
Host: I didn't have the opportunity to meet them in person but communication was excellent.