On the other hand, extremely limited artificial light, so this would have been penumbral the entire day, with the possible exception of the moments where the sun really faced the window.

According to the plan at the bottom, the window would have been east-north-east and thus really only useful early morning, if at all.

I just spent 5 years locked in a room with no window and 24x7 artificial lighting, so they have it way better than some modern folks.

Let's not be ridiculous. This room has no artificial light and almost no natural light, minimal ventilation, no water, no electricity, which is the norm nowadays even for cheap apartments.

In Toronto you could get $1800 a month for that or sell it for $600k.

...but not prisons

I lost my ke... wait, no it was a cell in a county jail awaiting trial.