Best international sites to market a Rio apartment

I'm looking to sell my 3-bed apartment in Rio (where I used to live and work) and hoping to sell it directly to international buyers. Does anyone have any recommendations for the best real estate sites to use for this? I see that Century 21 has established a presence in Brazil since I was last there.  Interested to hear if anyone has experiences with them or others that can provide a good service and have a good audience among US/European buyers. Thanks.

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