Floor plan single-family house in Rhineland-Palatinate

I have to disagree with you: Just look at the entrance (directly to the right after the front door): There is plenty of space for coats and shoes. That’s more than enough.

Do you want to cover the window with jackets and coats? Otherwise, I don’t see much storage space, or is all of that supposed to go in the utility room upstairs?

Then the window has to go, which would be a shame.

Upper floor: ok
Ground floor: in my opinion unfortunately not:

The dining table comes significantly closer to the kitchen than where you wrote "pointless space." This makes the living room "airier." We deliberately chose it this way.

At the entrance, the wardrobe comes to the wall next to the shower. The window is not that big (only 80 cm, "high window" - a shoe cabinet fits there without any problem.

You want to hang the window with jackets and coats? Otherwise, I don't see much storage space, or is all of that supposed to go into the utility room upstairs?

Compared to our current wardrobe, that's already a lot - moreover: there are TWO of us. But we'll take a closer look at that again. Thanks for the tip.

At the entrance, the wardrobe is placed on the wall next to the shower. The window isn't that big (only 80 cm, "high window" - so a shoe cabinet fits perfectly there.

I see the plan for the wardrobe, but I don't find it fully developed yet. There is certainly space for shoes here, and just enough for winter jackets for two people. But what about guests?

I would place the wardrobe under the stairs from a sufficient height and only shoes at the entrance. A key rack and such still need to go somewhere ... there I would have a shoe cabinet under the window and maybe a dresser or something similar on the wall next to the shower.

Regarding the stairs: Is the direction of ascent really a must-have?

The dining table is much closer to the kitchen - than where you write "useless space". This makes the living room "airier". We chose it consciously.

Mmh. Think again about whether that is really a gain. If you push the dining table towards the kitchen, it will quickly become very tight there. The space is also useless to me because, no matter what you put there, it remains uncomfortable. Have you ever walked through in 3D from the kitchen towards the living room? If yes, put the dining table there and walk through again.

The long dark hallway also doesn't win any awards. For me, that means useless space, so compress the office and hallway properly. That saves space endlessly (and therefore money) without any real loss - on the contrary. Office - maybe better separate it upstairs from the utility room and make the technical room a bit bigger. Replace the door to the useless space with a 2m wide glass wall with glass door or similar.

I would close off the garden tools area at the back. We have 8m between the garage and the house wall and the wind whistles around our ears considerably. Do you know howling it is when it’s only 3m? A real wind tunnel! ;)

I wouldn’t have expected the wardrobe there.