Actually, to make sure your fridge stays really cold, you need to leave the cabinet door open. If you keep the cabinet door closed, the fridge can't expel the heat from the compressor. It may not look as nice to leave the cabinet door open, but it makes a huge difference. Mousekeeping always closed it when they cleaned but we just opened again upon entering the room. It may look nice not to see the fridge in the room decor but a fridge needs air space and lots of air circulation to work properly.
OK...I'll shut up now.....