Single-family house 150 sqm - Quiet village, space to the neighbors

Well then:

Why? Inside he can still move walls around as he pleases.

But it doesn't help if you realize that everything somehow feels cramped.

Maybe too much space wasted?? Living-dining room too tight?

Yeah. In my opinion for a 2-person household, too tight. For 2. Unless you like to save. Whatever for. For 4 I find it insufficient.
Okay, the man can retreat to the basement. Or the woman, she can go ironing. Is that really what’s intended?

The open space also lacks floor-to-ceiling windows that would allow a view into the planned beautiful garden.

We wanted the 2 WCs, we are then 4 people + friends/boyfriend/girlfriend. So in the morning it can take a bit longer to get ourselves well distributed.

Completely exaggerated expectations. One shower toilet would be enough. For me the space is totally wasted.
I would create a storage room on the ground floor, e.g. where the tiny WC is now.

the bedroom bed just has to be placed in the office,
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I don’t see the bed there. Where should a bed be? And a wardrobe? Where should a wardrobe be?

Tomorrow there will be more answers. Good night, regards

Completely exaggerated ideas. A shower toilet would be enough. For me, the space is completely wasted.

I see it exactly the same way. The space is much more urgently needed in the living area. You can't poop as much as you want to eat.

Is the office enough to build a parents' bedroom in there?

What ceiling heights have you considered? The staircase with its 14x19 cm suggests a maximum usable finished ceiling height of 240 cm.

By the way, plans without dimensions and plans that no longer represent the current status are always unfavorable for assessments.

The office seems a bit small for a double bed and wardrobe. If someone needs a walking aid, it won't fit at all.

Is the ceiling height of about 2.4 m high enough for you? For me, it would be too low for a new building.