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.

You have a great opportunity here. I do not recommend placing a tv over a fireplace. Yes, we see it often, but it is not practical for two reasons: 1, the tv has to be placed too high and 2, it is hard on the eyes to be looking at the fireplace light and the tv What I would do is to remove the plaster and re-expose the brick. You could paint it an interesting color or resurface it. Then, I would add a unique mantle.If you have the funds, ideally the threshold should be removed (more contemporary) or resurfaced (more traditional style) The wood store could be a book shelf or display shelf. In the right corner, I would place a comfortable reading chair. The TV I would place on a different wall. Without seeing the entire room, I am not sure where.

A very simple layout keeping the floor space within the kitchen, the WIP takes up a lot of space with not much gain, The broom cupboard could be moved to the Laundry/entrance, narrow. If the wall has been bumped out to the eaves on the deck side giving an extra 300 depth to the kitchen you could make the island 2700 x 1200 and all drawers. The wall of narrow pantry will hold all pantry needs and more, no deep cupboards to dig into. cheers

Pic 1 Pic 2 Pic 3 Earlier in 2019, we retired into town and purchased a property for the location, not the house. The house is an old Lockwood with a questionable floor plan and poor traffic flow throughout. We will embark on kitchen, en-suite and master bedroom improvements in 2020. I also intend to completely paint over the wood using Resene Triple Merino. The single living space has a long barn-like appearance. It's a good sized space but the traffic flow makes it a difficult space to set up furniture etc. In the meantime the old obsolete styled, gas space-heater decided to 'spit the dummy' and we are having to replace that ahead of schedule. This has presented a dilemma. Where to locate it in the lounge so that it will work with the improvements scheduled for next year. The new fire is much larger in the room than the old one. I would really appreciate some thoughts on how to make my new gas fire more aesthetically pleasing. Originally, [pic 1] it was thought it should be placed straight on to the room but that looks wrong as is evident from the photo. Also, fire regulations have squashed that idea, because the curtains and wooden beams are too close. In Pic 2, the fireplace has been angled slightly, to overcome the regulations but the wooden posts prevented a nice 45 degree angle being achieved. The new angle now means that I have to reconsider how to rearrange the seating in the lounge for the traffic flow to work but more importantly, I'm left wondering, how do I add finish the fire? Do I build a false chimney and how do I work in all the new angles. I'm usually able to come up with good ideas to overcome problems, but this one has left me a little stumped. Pic 3 shows how I thought I might angle the couch.