i think mine is stallinsrad, cause of all the rooms and windows. its ideal for a sniper war.
and its smal easy to navigate a friend trough the map:
if i am in the west building 3 floor suith side and get killed there,
i can tell a friend where to find the enemy cause of the buildings
you got west, east and south buidling an courtyard,
and got the floor numbers to navigate on.