I am in my first place (6 mo short term small one bedroom in Recoleta) from homeaway website. As with Noruega, I contacted the owner by email and we negotiated a price. She was asking U$S1,000 and accepted $8.500 pesos/mo which at the time was about U$S567/mf course, the peso has gone against me and rent is U$S640 this month! Furnished, balcony, upper floor, no problems yet with fibertel or anything else, one month deposit. This building has 54 units and only 20% of owners live in them - the rest are rented, but no idea what they go for.
Wow you really lucked out!!!