An energetic city with a mix of Latin, European, and [some] African cultural influences. Cheap (for outsiders) and hipster vibes. A popular favorite city by those who like a high-energy fast-pace city…like New York or Paris.
You could probably experience most things within 5 days and move on to something else.
UPFRONT DISCLAIMER: I am not the biggest fan of Buenos Aires. It is far from my favorite big city and “Portenos” or “Portenas” (people from BA) are also not my favorite people. It may be better for you to read a guide from someone who fanatically loves BA.