Almost all over the world (well, northern hemisphere, opposite for southern), the best location is the top floor with west or south orientation for light (as long as it isn't an attic with sloping roof).
I have seen exceptions in Spain, where foreigners want south and west facing, but Spaniards want North facing to avoid the sun. I have seen exceptions on top floor issue in Romania and some Russian cities, because of unreliable lifts. Bought a super top floor apartment in Romania once at about two thirds the price that was being sought for one exactly the same on the ground floor.