Hi jdublya, happy new year and sorry about the late reply! I ended up doing the safe / lazy thing... left the floor untouched and painted a feature wall deep grey, as well as having two-toned grey curtains to both the sliding doors, and a dark grey area rug. The open plan living / dining gets lots of light, so it's still bright even with all the dark greys. We've paired it with mismatched sofas in light grey and brown, and sage green throws. Overall, it's still a "warm" look and not the cool Scandi look I would have preferred, but it's cozy and the greys have really calmed down the red. It's a lot more to my taste now than the show room furniture was. Bits of the floor finish are coming off though, I think (where the kitchen island stools have been dragged over the years by the past occupant), so in time I will get the opportunity to re-do the floor and it'll no longer be red!

If your home is tiny keeping the same style all the way through will make it feel larger but you can do whatever suits your needs and what you are comfortable with. If you have an eclectic set of items tie them together by selecting a colour that is common to majority of colours and repeat in each room, it could simply be a candle in that colour or a cushion with a hint of it. It does not to be a large or dominant piece.

Update above - this is what we have done so far. We decided to not paint Hog Bristle but paint ceilings Vivid White and walls in Haymes Organic 3. We felt it would be too stark in just Vivid White. Organic 3 is a nice light linen colour. After living in the house for a few weeks we have decided to keep the floors as they are. Wished we could have afforded to put in longer skylights - the room is facing south so no direct sun. The skylights have made a huge difference though - thanks to Gary at VSKY skylights (Gary is installing the skylights on 2017 The Block) he did an excellent job. We also installed bifold doors to the patio area as the previous owners dog had chewed and scratched the cedar ones to death and they had to go! Now to the kitchen and bathroom!

Full built ins across your window wall would look amazing. Maybe consider keeping drawers along bottom for a clean look and hidden storage for not so pretty items and then shelving above. Taking it all the way to the ceiling would look great too. For the short wall next to the door you could think about shelving to the inside of the window seating for a different look like the images below. We would love to see your final outcome!