We can't see the sofa and two chairs so our hands are tied. Is your rug at least 2 feet wider than the sofa? Center the rug on the fireplace about 18" away from the hearth. Put the sofa on the longer side, perpendicular to the FP and facing the slider. Add the two chairs (possibly with a table between them) on the narrow end facing the FP. Place your bench under the big art right of the FP.

How does that look? Or do you even have the furniture yet?

Well, you'll have to get creative with the tables and lamps to keep it from looking too matchy-matchy, but the style is great.

Here's some color in an MCM style table lamp.

Adaliz Glass Table Lamp, Green · More Info

Robert Abbey Jasmine 1 Bulb Marine Blue Table Lamp · More Info

Well, how about this: put your sofa where your coffee table was in the first picture -- parallel to the fireplace. Put the coffee table in front of it. You only need about 20" between furniture in order to navigate around it. (this coming from someone who lives in 812 sq ft). I'd angle one of your new arm chairs in front of the window, to the left of the FP, in toward the coffee table. I love the tripod lamp that you posted. Maybe get two? (I'm also liking pharmacy lamps at the moment, but that might be too traditional for what you're looking for.) Your second arm chair might go at a 90 degree angle to the sofa.

Behind the sofa, I'd get a long sofa/console table. You could also add lighting there with buffet lamps. And you might need some type of table/console/fun piece to the side of your angled chair so someone could place a drink on it. Maybe even nesting tables. Enjoy.