Here's a rough diagram of the apartment:
There's absolutely no air flow in the apartment, probably because of the directions (up = south)
The worst area of the apartment is the left section, as it contains heat-generating appliances (refrigerator, cold water bar, etc)
What would be the best way to ventilate the apartment? Will putting a fan on the window do the trick? What should be the direction of the fan - to insert fresh air from outside, or to exhaust hot air from the inside?
Usually all doors and windows are open except for the small window on the bottom-right side of the diagram.