I can't recall when the decision of travelling to Buenos Aires for a few months was made and why. I guess it was a part of the world I never had the chance to explore and the fact that I knew absolutely nothing about it but a blurry image of the latin culture and gastronomy.
The city has its perks and drawbacks. I heard a lot about precautions to take when you are a foreigner. The streets downtown, el Centro or la Boca, can be dangerous, especially at night, like in most metropolises. One common advice is to always be aware of your belongings (I know it from experience) and carry your bag in front of you. For foreigners, it is difficult to withdraw cash even in ATMs without extra fees so people usually bring loads of cash with them or use credit cards in certain places.
The beautiful side of Buenos Aires is the culture, its eclectic architectures from the busy Centro to the suburbs, the urban and natural landscapes and, oh my, the food. Argentinian specialties include asado (grilled meat), empanadas, dulce de leche and many more.
As for renting an apartment or a room, Airbnb is surprisingly not the best option. The prices are much more expensive then the standard prices. Palermo and Belgrano are nice neighbourhoods to stay at, while I would avoid the unsafe parts of the Centro or La Boca.