I think the longer the rental agreement the better your chances of getting the apartment at a lower monthly rate. Other dependent factors might include location and asking price. If the apartment is already cheap in a lower-class neighborhood then I doubt the owner will lower the rent. If the apartment is located in, say, Barrio Salamanca and the rent is high, I'd doubt the owner would lower the rent.
If you have a "line" on a particular neighborhood or particular apartment and would like to give us its address and asking price we can do our best to give you our opinions about its worth/location.
Stay warm, eskimo joe!
Saludos, MadridMan
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