Jennie, the paint looks fine just the way it is. You can add color in paintings, and accessories. However, right now, there is way too much pattern and color in the couch area. The room looks very narrow. The couch has way too much on it. The rug pattern is too busy. A solid color rug would look better in that narrow room. A new light fixture (lighter and not so heavy looking), in the dining room, and it should be swagged over so it is over the center of the dining table. I am seeing a couple types of light bulbs. Some are a bit whiter, and I like them, some are way to yellow. Replace the bulbs with daylight type led bulbs, that are about 3500k. That way, you will have much better lighting. In the kitchen area, you may want daylight type led bulbs that are 4000k.

I do realise your rooms are long and narrow, but, all the furniture just lined up against the walls, makes it look a bit odd. See if you can angle some things, a bit, and remove some things, so it doesnt appear to be so cramped and cluttered.

This is one of my faves for just this situation I cut it 25 -50 % often for a less intense shade but it looks great with wood and is IMO a true neutral have never found a color thta does not work with it. It is a BM color IMO all one color will make the space feel larger and allow all the different decor from space to space .

I would not cut up/chop up an already cut up jog/turn/bump space with changes in wall color.....UNLESS very tonal and two would do it and keep the green warm. Ixnay tan

Then add defining rugs that are complimentary and harmonious and make large and expensive upholstery pieces neutral as you like, and add accents in chair, or pillow colors.

The DEAD LAST color on the walls that I would want? Tan anything....

Why? The wood trims and flooring.

If you want a green on the walls? Fine you test it and you test warm greens, then add all the neutral upholstery you like.

the stairwell is a great separation point. I'd keep the kitchen lighter and the living room space cozier. I would personally paint at least the sofa wall a dark color gray/blue similar to the sofa color so it disappears into the wall. ...you asked for suggestions.

The only way I think different colors will work in such an open space is to use colors on the same chip, meaning they would be the same color except darker/lighter versions. However, since row homes are narrow and deep and don't get much natural light, I would just paint everything white. The color is in your art. There is nothing wrong with the color you have now, but if you need to paint you could back off the yellow a little. Just be sure to still use a warm white to complement the wood tones. SW Alabaster is a popular color.

Actually the warm white color you have harmonizes very well with your "givens" wood floor and trim throughout. To repeat what several others are saying: streamline some elements--new living room rug with warm tones in a less busy pattern. Pull your colors from your art over the sofa. So palettes that have golden browns then the blues from the art:

Vingel Hand-knotted Traditional Rug, blue/brown/gold/Gray, 7'9x10'6 · More Info

Then tie your sofa and pillows to art and new rug--reddish gold, blues, gray.

Off-White Wool Blend Lumbar Pillow With Blue and Brown Pattern · More Info

Get a large horizontal artwork for the dining table wall that echoes cream walls, red/gold floors, new rug. These from society6.com. Another landscape would give you the sense of the outdoors at the back of your townhouse.

Or pair two square or vertical art works for dining wall:

If you're ever changing out your dining table, get a round, expandable one to float in dining area. Use round size day to day then oval when/if you have more people to seat. Also try to match any wood finishes you bring in to your warm wood trim. This isn't quite it, but you get the idea. What gives a room flow and harmony is having similar tones and finishes along with wall paints of the same shade throughout.

Coastal Beach White Oak Round Expandable Dining Table 54" · More Info

Painting would maximize what you own in real estate, big time. Should you want to spend money on furniture and art, is up to you, of course. All the orange wood, make it gone. Walls, thinking B.M. Gray Mist.

https://www.blesserhouse.com/i-found-the-perfect-green-gray-paint-color/

Charming home.

I love these two colors with wood like yours (and in one, similar brick). I think your style of house is made for colors, especially with the neutral furniture scheme you’ll be doing.

Sherwin Williams Homburg Gray:

Sherwin Williams Pewter Green:

Another I’ve had saved a long time — a fabulous townhouse in Harlem, painted with Benjamin Moore Dark Pewter:

Maybe not going as dark as these, just showing some beautiful, rich colors that really highlight the lovely stained wood. And of course your lighting will be different, these are just examples.

I think the right white can look stunning with stained wood, too:

Also love Farrow & Ball Drop Cloth:

In fact, a consultation with Farrow & Ball might be worth considering, if budget allows.

As far as what/where to paint, if it was me I’d paint each room we see (living and dining) the same, and might look at wallpaper for the inset wall in your dining area.

I’d probably wait on paint, though, until you know exactly what furniture you’ll have.