Downstairs at Olympia.Penny StephensOakleigh basks in the glory of all things Greek,but Olympia takes it a step further. An old car park above Oakleigh Market is now a double-decker ode to the Greek Islands,its rooftop bar whitewashed,with ocean blue shutters and a stone-look floor. The menu is just as on-theme:espresso martinis are shaken with Greek coffee liqueur,and there are crisp saganaki croquettes and soutzoukakia,the Greek meatballs,to snack on.