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You will need an area rug to set off your seating area. Find one that has your basic wall color, or some hue of it, and then use the other colors in the rug to determine your accent colors in your new space. That will create interest, harmony in the open space plan, and easy to find accessories. So you will have a color pallet to start from. Buy a rug with colors you really like. Good luck!

Depends on your taste, but a faux grasscloth wallpaper might be a groovy choice for an accent wall. Really depends on your style. Can you post photos of some of the "stuff" you plan on putting in there so we can gauge your style? Or maybe you know it. Anyway, my long range plans are for grasscloth in my dining area. Google it and you will find some great examples. Note: go for the fake stuff. I lived with real grasscloth, it is extremely fragile and gets torn, dirty, stained and damaged easily.

What did you decide? i just bought a row house with a similar layout, painted it white and I can’t figure out which wall.

we kept the wall neutral and put up colorful artwork. We may sell the house anyway within the next couple of years

My last house was a row house. I sort of had an overall aesthetic for the whole space, starting with a warmer version of the palette in the living room and becoming cooler towards the back. I actually had bold wallpaper in the dining room which came with the house, and since that part of the house had the least natural light, I liked it. Not saying I would repeat it, but it is one way to go. In the end, the dining room walls ended up being covered by storage units that were practically wall to wall, so if I had to do it again, I would do as the original comments suggest, just stick with a neutral wall color and punch up the room walls with art. Cool art can go with you when you move too.