Tandem German Spanish (Vienna)

Hi,
I'd like to really really practice German, having feed back and corrections as needed. Am enrolled at B2 level- may be too ambitious. I'd like to meet once or twice a week to speak German with a native speaker. Likewise we would meet separately to speak only Spanish (am Argentinian, born and bred in Buenos Aires....you'll get the right accent :-)....
Cheers and Happy Holidays...
Liliana