Ok, pompella comes to mind, lugano, sodati, baracas... these examples are not recommendable for someone who doesn't know their way around.
@elcolo: I't does not annoy me, it is merely an observation, but given that you state "... for most people these are generally accepted as the best locations to live in...", this is the domino effect of only accepting the recommendations of a few; and given that these handful of neighborhoods are frequented by expats, does that not in fact then become known to the locals as "places for foreigners". The locals know it, criminals know it, cheats and scammers know it; so maybe it becomes the worst place to go to. At least mixing with the locals in neighborhoods where the average Argen-Joe lives homogenizes the situation and it doesn't become such a target. Plus, you get to experience real-life living abroad as opposed to being a dura-tourist.
Plus, all those neighborhoods are a lot more expensive than, say caballito (which is close to a lot of things-to-do, at less of the cost).
Oh yeah... palermo ?!?! Floods ?!?! No thanks
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