What to do with the master bathroom and door on one wall

The kitchen door can be a little lower than the room door, and the bathroom door can be made invisible.

It doesn't matter, but if you feel awkward, you should change places, because if you think about it all the time, you will be uncomfortable even if there is nothing wrong with it.

That depends on how big your shower room is, the washing machine is generally the width of meters, and the basin is about the same meters away from the wall.

In my experience, I can only make the windows higher and add exhaust fans, and exhaust from the ceiling. Of course, there is no way to solve the problem of light.

It's better to separate. Because the water heater will emit a lot of water vapor when we use it, and then hang it on the wall. When hung on the wall, condensation is generated, and the condensation is left behind in the wall and flows to the electrical outlet. This is very dangerous.