It's no news that such a small space needs integrated areas and light colors so it can look bigger. Having two doors in the bathroom is a simple arrangement to provide privacy to the couple in case a guest needs to go to the toilet and does not have to go through the bedroom to do so.
Small spaces not always need to be covered in white. Painting the walls with a warm and colorful palette and adding fabric pieces bring texture and coziness to the place.
Cabinets tha do not go all the way to the ceiling can make it look like the space is higher than it seems.
A couch with no arm support helps the space not to feel cluttered.
Round tables are always a good option when it comes to small integrated spaces because it gives more circulatory space and allows more seats to fit in, when needed.
Toned down colors in the bedroom when you have social areas with lots of contrast is a good idea. It brings a sense of quietud and relaxation. Here the colors are a lighter version of what we find in the living room and kitchen.
An embedded floor-to-ceiling wardrobe goes a long way in a small bedroom. The colored, but neutral, woodwork brings live to the space and the mirrored part adds lenght.
Bright, spacious and clean. A 6m² bathroom can feel like a true bath room when it's well designed.