I came to Buenos Aires to begin a career as an English teacher and needed a place to stay long-term. I stayed at Fernanda's apartment in Palermo for 7 months, and it was perfect. If you're staying in Buenos Aires for a while, I can't think of a better location than this part of Palermo.
It's located by the C.T. Pacifico, which is a massive hub of buses that can take you anywhere around the city. This creates a level of public transport convenience and efficiency that's unparalleled in BsAs.
Aside from that, it's walking distance from great nightlife, and places that sell food 24 hours a day are just a block away. The neighbors are friendly and helpful, and the apartment is cozy and perfect for 1 single person. I felt attached to the neighborhood and was sad to leave!