We loved our stay here. The location is GREAT! Quick walk to a ton of great restaurants, amenities, and nightlife.
The apartment was very clean and modern, and the bed quite comfy. The kitchen was also stocked with everything needed to cook meals.
The only issue we really had is the bathroom would randomly have a putrid sewage smell - it wasn't all the time, but it was gross when it happened. Made taking showers and baths less pleasant, but closing the door would mostly prevent the smell from coming into the rest of the apartment. I would hope this is a temporary issue and would be fixed in the future.
Other than the above issue, we had a great stay and would definitely stay there again next time we're in Buenos Aires