My toilet and the house are separate, and there is a first floor above the toilet, which is dedicate

Do you mean that when the doors are all open, you can see the toilet in a straight line? If so, it's definitely not good, the door and the toilet are in the same direction, but not in the same straight position, even if there is a wall to block it. Generally, the entrance door of a house in the countryside is a hall.

The toilet itself has high humidity, and it needs to be ventilated and dry, otherwise it is easy to breed bacteria, and if there is no ventilation, it can only be equipped with ultraviolet germicidal lamps, and then cooperate with dry mops and antibacterial mats. If possible, install more exhaust fans to enhance the flow. The living room is dark and can only be made up with the ceiling dark groove background fluorescent lamp light, looking at the picture There is a window to the north, and there is probably no hope for lighting.

Open the toilet door to the living room.

No problem! This is normal!

Because the bathroom is damp, the putty will peel when it sees water, and it is best to stick to the wall tile ceiling, so that it can be prevented.