You can put the TV over the fireplace, not the best situation but the way the room lays out it is the only logical place to put it. If you could you should add one additional layer on your mantel that could extend it out another 4" to deflect the radiant coming from the fireplace. I would also mount it on a slimline mounting bracket and have the bottom of the TV no further than 4" above the mantle. Ideally you want the TV to be in as straight a line as possible with your eyes. You don't want to look up too high at the TV, it's like being at a sports bar. Also if you can snake up the power and the HDMI from the cable there is a box they make that has both in one so it makes for a very clean installation.

I would place the sofa facing the fireplace either with access to what's behind the draperies or not, and put the tv where the chair is--roughly. On the far end I'd arrange a small conversation/reading/activity area. IE:2 chairs, a table and a lamp or a small activity table with a hanging lamp. Of course, seeing the scale of your new furniture, once you receive it will help. I just hope you have selected comfortable furniture in a smaller scale than what you have.

Good that the heat/air system is over the door and doesn't interfere with your decor too much. It appears the ceiling fixture to the right of the FP might indicate that the dining space is there. Put a sofa in front of the FP and two small accent chairs with it, facing each other over a round glass coffee table. Can you wall mount the TV left of the FP? I think the room is too narrow to put the TV above the FP - you'll strain your neck. If you mount it opposite the FP, a sofa and two chairs could work but will need to be small scale - try apartment-sized seating. The sofa could face the window with the chairs opposite it. You could turn to see the fire or to watch TV. Swivel chairs come in handy in such tight space.

Your suggestions are really greatly appreciated. My town house unit is under complete exterior re-cladding works, prompting quite substantial interior makeover (i.e installtion of ducted air con, replacing wall to wall carpet with timber upstairs, and tiles in open space downstaris, replacing creamy wall paper will be replaced with neutral white paint. So my green kitchen with creamy formica counter (bench) top should go. I don't hate green simply had egounh of it after long 15 yeras! My small U shape kitchen is due for complete makeover, I think! I'll probably go with new cabinets (lower one for microwave) up to the ceiling, when move fridge at the end I'll go with panel with matching colour up to the ceiling, expanding counter top on the other side to the fridge. I guess that removal of the cupboard can be compesated with extension of the counter top so we can fit 3x drawer underneath and cabinets up to the ceiling can provide some useful storage space. Backsplash in same white palette or darker in contrast? Your kind ideas please!