I have a 700 sq' loft, meaning no rooms, just a bathroom with a door. My bed is next to the kitchen and my shooting place extends from there, sinks and enlargers at room front.

Everything in one room. I also have the entire space lit by LED red light 24/7.

I fool with film in the bathroom.

Computer station in the middle.

powerful exhaust fans

zero daylight, I have to open my front door to see what is happening outside.

Works for me.