To get a Swedish looking interior, use white (or very light colours) walls and natural mat finished timber floors. Even white stair with natural timber steps looks so clean and fresh. This stair had carpet and a dark red stain on it. My customers thanked me for suggesting the 'Swedish look'.
Another couple wanted me to sand their Tassie oak floorboards and paint them with white concrete paint. They love the clean Swedish looking floors. So I first primed the floors with Solver pink primer