I spent about 4 weeks in ASU in 2010. An interesting city, but much of the city totally closes up after 10pm.

Had some nice 5k Pointbreak nights at the Crowne Plaza there, included breakfast too.

Flew GOL from EZE. I think Pluna flies there too. Getting the visa was a bit of a pain, but it is valid for 10 years, or when your passport expires, whichever comes first.