Added a few more bits... Hope it helps... ( coffee break over ! Back to work !)

This is my favourite layout. Personally I think the room will look better with a smaller table- perhaps you can get one that extends? In my experience sunlight glare is worst when the tv is at right angles to the window and better when facing the window.

Lovely fireplace, I think it would stand out better with a bold colour on the wall. I have a similar look to you -windows either side of fireplace and I created a fake chimney breast look by masking straight lines down either side of the fireplace and just painting bold there. You have a lot of curtains there taking up floor space... so I don’t think you can do much in terms of furniture unless you want to stand a low dresser in front of them...

It's further than I thought. My concern was the stepped in wall and also the opening to the dining area but as it's further up than I thought the ".entrance" should be fine. You would however be left with an alcove between new and old fire. I wonder what shelves would look like there (I couldn't find an exact pic) or just box it in.. Tadelakt is similar to polished concrete, polished plaster, microcement etc, you could look at any of them just to add a bit of texture/warmth. You could always pay someone to do a CAD design in your room if this is your preferred option? Having said that if you frequently have large parties maybe it's not a great idea to have a fixed structure there? Maybe a tv and fire side by side is a better option? Will see if I can find a pic