I am not sure where the walled in heater is that you are referring too. Attached would be a nice layout for your space. Ref= Refrigerator R=Range DW= Dishwasher C=rolling cart

If having the master BR door open to the kitchen is preferable to the long, narrow hall, the kitchen layout could be m/l flipped to give you a traffic path along the interior wall. I can't tell the exact kitchen measurements, but doesn't look as if there is space for seating at an island. The distance between the fridge and range would be more than the minimum recommended by the NKBA. Where is the dining room? Is a pocket door to the guest bedroom vestibule a possibility?An alternative would be to move the sink to the space between the windows, which would also get the fridge a step closer to the range. NKBA guidelines New to Kitchens? Read me first.

This is a bit off topic but the space between the vanity and the shower looks tight along the path to the walk-in closet. The gas chamber looks confining (think public toilet stall), especially with a tall ceiling. Because of that and the shower head arrangement, it leads me to believe there are other areas in the house that could use some adjustment. Has the construction started on the house? If not you may want to post the floor plans and exterior elevations and site plan to get some review. But as always . . . WARNING: Posting your entire floor plan opens you up to facts you may not want to know, but should. Be prepared for suggestions that will make for a better design. Keep a thick skin, open mind, sense of humor, and a glass of wine within arms reach. You may not enjoy it, but everyone else will and you will be better off in the long run if you heed well the advice.

TV wall inspiration pics: Don't worry if the window is off center as the window treatment will adjust it. If you take some pic and post, it will help. The TV area can be as simple as a low shelf and wall mounted TV surrounded by art, or bookcase/storage, depending on your needs. Again, another important wall you will see when entering your apartment.