It is good for the old man to live in that room in feng shui.

Old people had better live in the south. Theoretically, it is warm in winter and cool in summer, but in fact it is more ventilated, and a dry bedroom will do. If you care about Feng Shui, you should find someone to make a field trip, arrange dishes and determine the position of wealth. Now that the structure of the house has been decided, there is no need to do these things again unless you don't mind unpacking and repartitioning the room.