Floor plan design of a two-family house

You enter into a square hallway with space to move and a wardrobe niche,

Exactly, that's how I had planned my apartment, too.

A semi-detached house is too expensive, about 1 million, and too big.

240m2 + basement costs for 240m2 + basement. Whether these are 2 horizontally or vertically stacked apartments does not initially affect the price. A semi-detached house becomes more expensive if you want 2 completely separate technical systems, but that does not have to be the case here. I am also not thinking of a classic mirrored semi-detached house, but one with 2 individual "halves" that can definitely overlap.
For example, the apartment for the parents almost entirely on the ground floor and only, for example, one room for visitors or nursing services on the upper floor. The main apartment with "only" dining room and kitchen on the ground floor and the living rooms upstairs.

By the way, for this size, I consider 800k completely unrealistic in Augsburg.
240m2 * 3500€/m2 is already 840k + basement 100k + additional construction costs.
Yes, it will end up at 1 million. One way or another.

Exactly, that's how I had planned my apartment as well.

I don't know if you live in an apartment building or on the upper floor of a two-family house, but ultimately the rule is: if you can get natural light almost everywhere in an apartment building, where neighbors usually live on the left and right and windows are often not possible, then it should certainly be possible on a floor plan where you have exterior walls on all four sides. You just give up uncomfortable, overly long hallways—i.e., useless square meters—and combine living space while separating the private zone.

I had to think of that: dusty old floor plans, back when living was not yet life.

No, they were even more creative in 1968. At least separate toilets and a "slanted" hallway to enable access to the toilet (60s door missing in the sketch).

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Oh, you just need to google a few home builders. After all, we live in the age of the internet. I find dozens of floor plan ideas within 5 minutes, truly all more valuable than the one in the initial post. I simply cannot understand how anyone doesn't see that themselves.

We are planning a two-family house near Augsburg. Two apartments of approximately 100 sqm each are to be built on top of each other.
I have now received a rough plan from my draftsman. What do you think of the room layout? The plot is 600 sqm and is longer than it is wide. It is to be built with a double garage and a basement.

I join the general call for more details / a completed questionnaire (and also the assessment of the design as run-of-the-mill). Incidentally, I feel greeted here by the groundhog: or