That's a good idea Astrid. Of course, they could place a statue, plastic/silk plant, etc. at the edge of the fire place (as long as it's safe and works with the room). The no plants in the bedroom is just for real plants.
Having a bed with a window above the headboard is just an issue if you don't close the blinds/drapes at night. It sounds like doing so, and having a headboard will give you plenty of support and keep you out of placing the bed in a corner.