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.

Might I suggest a more contemporary picture frame mantel with mosaic stone tile between that and your firebox? Love the near craftsman window shapes flanking the fire wall . . . use the height on both sides, / shallow shelves on one side can visually frame a swing arm for your television and give real storage on the other side.

Depending on functionality, how your island is used, it can be somewhere to showcase a different material, as in a traditional kitchen with a substantial timber top, or if it's a practical prep area, the durability and maintenance is of utmost importance. If it is a highly utilized work area the surface would be best suited to reconstituted stones, which are man made such as Caesarstone, essastone, quarel la etc, as natural stones such as granites and marbles are more porous and require some maintenance and care. Depending on form and style, your options are almost endless. Cntemporary spaces can indulge in stainless steel tops, acrylic solid surface tops that can be any thickness, profile and can actually be repaired without joints. Glass or concrete are more options. So you ask for help on choosing your island bench top, That is dependent on a great many things. Factor in how you would use is surface, and what you can afford, then think about the overall impact these options can provide on the entire space. Eliminate. And collect samples to make your decision. It will probably become the single most used space in the house.

Is that a window in center above the hearth? Is rock just a facade? Looks like you have a mixture of furniture styles. Windows look more of the modern style while drapes are traditional. I would say pick one style and go with that. From the windows I'd be leaning modern/ contemporary. If the rock is just stuck on wall take it off. Replace with horizontal wood planks stained same as your door casings. No mantle. If that is a window I would either have a stained glass insert made (again using modern lines) or do a faux stain glass painting treatment to add some visual interest.