To see where is the Gene Kelly Ballroom (Kifisias 215, Marousi, Odeon complex), click to the link: http://maps.google.com/maps/ms?hl=el&ie=UTF8&msa=0&msid=100013182194528104389.00047f276d527a0e0cec3&ll=38.059057,23.809937&spn=0.006243,0.013937&z=17 

To see where the Quickstep school (L. Vouliagmenis 583, Argiroupoli) is for Sunday's tango marathon click to the link: http://maps.google.com/maps/ms?ie=UTF8&hl=el&msa=0&msid=100013182194528104389.00047f27064dfba2a31f6&z=17