"Why would you want to paint your house all one color?" Because that's what I (and apparently the OP) WANT to do. That's what I like. As an added bonus, it makes it easier, cheaper, and more efficient to get it all painted. Fewer brushes and rollers are needed and you can keep reusing them from one room to the next. Actually I'm going as far as painting in 2 colors. One wall of the great room and the kitchen will be different than the rest of the house. I may do the bathroom in the secondary color as well, that hinges on whether or not that color looks good with the existing tile. If not, I'll stick with the more neutral main color in there as well. I find it more cohesive NOT to paint each room a different color. I had enough trouble settling on the 2 colors I ended up with as it was, LOL!

I know you suggest having two distinct colors, but think of the space as one big open plan where the wall color gives a sense of spaciousness and flow. Personally, I would find the dark charcoal too dark since you're not getting maximum daylight in there. Are those the actual floors or a floor covering? You'll get plenty of suggestions if we know what those floors are. It's a very nice space for someone. Renters often come up with very clever ideas for dividing space--open shelf bookcases are one thing some renters do to set aside bedroom area.

Looks like you have a fun project ahead of you! I would agree to post a couple different threads to really hone in on interior vs exterior. It will be less overwhelming.

Looks like there are no pics here?