In the office on the upper floor, the wall on the left side of the plan is only poorly usable.
Think about what kind of cabinet would fit there (depth!) and, if necessary, move the door a bit to the right AND make the window a bit narrower (on both sides). Maybe 20 cm additional on each side will be enough.
This way you gain cabinet-usable wall space.
Side note: There are some residential building insurers who charge a surcharge if the washing machine is not on the lowest floor.
And on the ground floor plan, the door to the guest room is missing. But it is clear where it should/must be.