SW Jersey Cream and Compatible Cream might be too yellow if you want something soft. Those shades are very good for brightening and warming up a room that doesn't get much natural light. But for a large area with natural light, I think they would go too yellow. SW Wheat Grass is also a fairly intense shade that you might not want in a large space, although it doesn't look like that on the strip. Looks great in a kitchen that is fairly confined to itself. SW Sea Salt or Comfort Gray (if you wanted to go a little darker) are very pretty and versatile shades for large areas. Rainwashed/Quietude is beautiful, but I like that best in a bedroom or bath. Although I have seen some kitchens with white cabs and Quietude that have been stunning. In your case, with those lovely blue tiles, I would let them be the star and go neutral in the kitchen with the wall color (creamy yellow/beige). Take a look at SW Ivoire and Biltmore Buff. They are more subdued yellows and make nice backdrops for open spaces. SW Believable Buff/Whole Wheat go more toward beige, but in light the yellow is more apparent. I don't have Whole Wheat, but I do have Believeable Buff and it appears much more yellow once on the walls than it does on the paint strip. They are among SW's top selling colors. Yellows are tricky. I've found that for my tastes, if I want a yellow/cream in a well lit space, one which tends toward green (not too much) looks better, but if it's in a smaller space or one that gets little natural light (basement or north facing, e.g.), a yellow that tends toward gold looks better. Since you have such large spaces to paint, I definitely echo the sentiment to do some sampling - even painting a whole wall (roughly) and observing how it blends with your other colors and plays in light would help a lot.

What a wonderful guest apt! You are looking for a 'soft' rustic look rather than a heavy masculine one so I think using your grey barnboard with white walls would work well. Reminds me of the pics I see on European blogs. What type of flooring do you have? Sea grass rugs might work well with this style - over some easy care hard flooring of course. Focus on textures rather than color with this scheme. I'll post some links that might give you some inspiration: "Color scheme" of pale grey, white, natural willow, and red accent. Painted furniture works well with this type of 'soft' rustic style. "Blog header pic" uses whites, greys, and natural materials. "from this blog" "from this site." "barn conversion" Of course another idea is to use color without going to the heavy masculine ones. Let me know if you need pics or links of that and I'll see what I have.

Benjamin Moore WISH AF 680 and ask the paint store to cut the formula to one HALF. strength. Like sleeping in a soft gray cloud. It's on the walls her at full strength, but you don't have benefit of light abundance

I’m not sure if Sherwin Williams is currently doing in home color consultations, but you should call your local Sherwin Williams store and see what they can offer. The color consultant in my area is excellent. We were doing a complete home renovation, and she helped us not just with paint colors, but with other elements of our design as well. (I had tons of flooring and cabinet color samples and was having a hard time making my mind up.)