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.