I am a member of the growing Brussels InterNations Community The large turnouts are no doubt explained by the large ex pat community in Brussels, many of whom are permanently based in Brussels (such staff at the Europan Union like myself).
I will be arriving in Buenos Aires for the first time on 19 December. I will be based in the Microcentro (Sheraton) until my return on 3 January. Sheraton has too pools so might help a Nordic like me to acclimatise : )
Earlier this year I went to Mexico City for two weeks. Before my departure I sent out a thread which proved very helpful to find my feet in a new environment. So I am doing the same with a view to my Buenos Aires trip.
So please do not hesitate to get in touch via InterNations if you feel like offering some advice, meet up for a drink etc.