Two metres one way, two metres the other. If it was me, I'd throw a mattress on the floor, but I want to insert one student and extract one rent.

No widows, but there's a window on the outside wall.

Look at the square below this, the one you'll write your answers into. Take a triangular slice out of the top left corner for the chimney (which has a nice upside-down-U=shaped theatre mirror over the small fireplace). The window is a big one that can open slightly by leaning in from the top, or swing right in like a door, depending on which way you work the handle.

The door is just to the right of "Clear Entries", and opens inwards.

The room isn't that high - maybe seven-and-a-half feet.