Chinese consider both sunlight and moonlght are absolutely good things, lights expels devil for sure. Darkness is for eveil. This is same as western culture.
Sunlight kills germs.
The favor of lights in my opinion also means favor for warmth, I would not consider bed room above kitchen is a bed thing, beside there are many remedy for the warmth from kithen below, like a fan on the window, open the door to let air flow, thanks to bkshops's previous posts about how to ventilate the house.
Western faced room are very hot in the evening of the summer, but it is a feng shui defect.
I have a retire aged coworker, the AC in office is too cold for him, he put a heater at his feet in his cubicle all the time. In my opinion, aged people need more warmth than young people, they might like the room facing west.