$1900 USD a month is light? I've seen people here talking about being here quite nicely for less than that, it seems to me, as a tourist. We're talking $25000 pesos a month or so at the current blue rate, or roughly $833 pesos a day. Or, roughly 633 pesos a day after paying $500 USD in rent (or the equivalent), which should be able to get you a pretty decent place. you could probably spend less on that even in a studio apartment, and if you want to go cheaper there are pensiones or hostels as well.
You may have to budget a little, and probably can't think about going around and buying a bunch of touristy stuff to bring back or eating out every night, but I'd think even with a small apartment for four months you could afford to have a decent time here.
You also need to think about how to get that $900 a month that you're earning, down here (that's, in my opinion, your biggest problem).
BTW - I know families who raise children on much less than $25K pesos a month...
You may have to budget a little, and probably can't think about going around and buying a bunch of touristy stuff to bring back or eating out every night, but I'd think even with a small apartment for four months you could afford to have a decent time here.
You also need to think about how to get that $900 a month that you're earning, down here (that's, in my opinion, your biggest problem).
BTW - I know families who raise children on much less than $25K pesos a month...