There are these classic Dutch houses that look like this. They are very efficiently built with 2 rooms divided by a sliding door and built-in closets. A chimney or stove in each room for keeping rooms warm easily. A bay window in the front and a balcony in the back.
Take the template room I drew here and give it a modern interior.
Change as little to this plan as possible. You can take out the chimneys to use a more modern heating, but leave the wall and window layout intact.
Inspiration: , 
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