@Marion54, I see you have a no smoking policy. I would write my review reflecting what you mentioned about the smell of smoke, the discovery of the odor-killer spray and that the windows were open, wasting heat and energy, costing you money.
If you ask for money now, before they leave their own review, you risk a retaliatory review. If you feel your current star rating can absorb a poor review, then go for it now. If not, you can also try to leave your own review now, hoping they will leave theirs soon and then you can request money right after.
How to figure it, I don't know, perhaps only for the de-odorization of the room?