HI guys i want to recommend you on a nice and new hostel i visited in Buenos Airs. it is very nice hostel with a lot of backpacking tourists. i met there a lot of new friends from all over the world.
the hostel called:DISCOSUR
it is located near to PALERMO neighborhood. very nice neighborhood with pubs and restaurants.
if you want you can find more information on their website: -snip-
[ Edit: Sorry, no commercial links please... ]