Cookie - I hope that all goes well for you. Your employer's sound very similar to mine. I work in a tiny dark box (we all call it the broom cupboard), no natural light, no ventilation, and a floor that slopes. Barely room to turn my wheelchair when there are two of us working in there.

Now there is a larger room across the corridoor, currently unused and just full of junk. It is an odd triangular shape, but it has windows. My colleague and I asked if we could swap rooms, and were told NO WAY, the finance department are going to put their filing cabinets in there. So filing cabinets need light and ventilation, but people don't?