Great space! The best way for me to help is to post a thumbnail sketch with all the dimensions and more pics. I would be happy to do a floor plan for you. First, measure the overall dimensions of the room, Then, start in the corner and measure the corner to the window frame, then the window (include the frame), window to corner, corner to fireplace, etc. You get the idea. Take pics of entering the room and any other details that are important. Measure all the furniture in the room. Make a Wish List indicating everything you want this room to accomplish. i.e. when you entertain, how many people are you accommodating? Do you want two distinct sitting areas? Bookcases? Art? Bar or bar cabinet? I am sure we can put our heads together and come up with something fantastic.

N Pow, you sound a little panicky, so let me suggest you take a deep breath and relax. No one ever died from sitting on one of these... ...for a week or two. The couch and chair and light fixture in your original post are pretty modern, so let's made sure you stick to that style. (I perused your ideabook and your first three light fixtures there will absolutely ruin any modern look you aim for. I suggest you find the living room on Houzz (or elsewhere on the internet) that you love the very most, save it to your ideabook, and then we'll help you copy it. There are over 139,000 modern living rooms here: https://www.houzz.com/photos/modern-living-room-ideas-phbr1-bp~t_718~s_2105 (No, you don't have to look at ALL of them.) The other things to consider BEFORE YOU BUY ANYTHING is the actual size of the room and how you will arrange the furniture, especially if there will be a TV. When furniture doesn't fit, there is absolutely no way to resolve it without starting over. That's not a mistake you want to make.

Agree with lynartist get someone knowledgeable in to look at the walls. Shifting the color used makes a huge difference. I would not have the walls smoothed or made shiny. But there are all sorts of ways to approach this and end up with a great looking home. Consider moving the functions of the two spaces. A modern dining area with a fireplace, even such an ornate one, could be spectacular and marry well with a more intimate USED space for conversations, drinks, and even just solo book readin'! Making the switch would also de-emphasize the fireplace and allow it to look its very best. A bit of a paradox but look at many old European houses and you'll see it again and again. My other preference would be to have a wood refinisher take down the shine on the floor. Congratulations and I hope you let us know how this progresses.

I assume those are MLS pix which are a bit stretched for real estate presentation and the blank wall between the windows is centered with the FP. What is the actual size of the room? While two sofas always look nice, their positioning never seems logical if this is the family's only TV room. No one wants a crick in their neck from turning their head to watch TV. How many of you will be watching TV here daily/nightly? Consider a 4-6 chair grouping around a hassock or coffee table so everyone can turn to TV or FP. Another option is the famously flexible 3-seat sofa and two chairs, all around a coffee table that is centered on the FP.