Here's what $53,000 USD will get you in Palermo, one block from Plaza Italia. It's actually listed as a "one bedroom" (dos ambientes) apartment:
http://www.remax.com...mo_420461008-20
There is no view but it looks like the kitchen and bath have been recently redone. I wonder if the "patio" is figured into the 24 m2. I also wonder what tourist would be happy renting a place like this when there are so many which have "nice" views (and would undoubtedly cost considerably more than $53,000 to buy).
The greatest drawback to the idea of buying an apartment like this to serve as collateral to rent a larger apartment (whether that is "acceptable" to any property owner or not) would be the difficulty of paying the asking price in dollars. Even if the seller would accept pesos, it is highly unlikely that they would accept the peso equivalent of $53,000 USD at the official rate (which is what you would get if you "legally" transferred the $ through the Banco Nacion).