You could try yellows or blues. Maybe add a feature floral, chinoiserie or trellis style wallpaper. Add green with plants and maybe a sunburst mirror. Dulux and I think crown do a visulaiser app so you can upload a pic of your room and try various colours. It's a bit tricky to use to start with but you get the hang of it after a few minutes

Hi Coba, I like your flooring, it's beautiful! For the bedroom I would go for a pastel blue paint, it's very calm and it helps with a better nights sleep too. It would look brilliant with the dark wooden floor and it would also match your lightwood wardrobe colours. For the hallway how do you feel about a pastel mint green? It's fresh, happy and it cheers up a small functional space with not too much furniture in it. Just make sure you choose a balanced colour that isn't super bright. For the living room you could go for a neutral colour or white, depending on the style and colour of furniture you have, then you could add pops of colour with art work, fabrics and accessories. Alternatively you could opt for a light pastel salmon(ish) pink paint combined with a matching geometric wallpaper. I attached images to illustrate what I mean. I think this would complement the light grey floor quite nicely. Hope this helps, but happy to discuss further if these suggestions are far away from what you'd like :)

A few more ideas. Love the black in the bedrooms...makes for such a luxurious hotel feel.

I wonder if you have space for something like this on the wall between kitchen and window. https://www.ikea.com/gb/en/products/storage-furniture/shelving-units-systems/veber%C3%B6d-shelving-unit-natural-art-10343328/ Scroll through the pics on that page to see them with stuff in them, so you can get an idea of how they would work for you. Maybe two of those? It will give you lots of storage and won't block the ventilation (hopefully). You can clamp a light on it, on the kitchen side, to give you light above the counter. With the central light you'll be casting a shadow on the counter/cooktop, so you'll be working in your own shadow. It's just an idea :-)