Our floor plan - 2 options

Basically, I prefer a two-story option. Upstairs children's area, downstairs living and sleeping (parents). But your floor plan is actually a bit convoluted. Possibly plan a conversion for a future granny flat. But it doesn't have to be :)

Your first version has too much hallway space. Even with a generous 10-12 sqm + good stairs (not at the entrance) you can manage well. Your stairs offer too much unused area. How about a 3/4 turn? Then you might have more options for the upper floor.
I would also plan the storage on the upper floor; whether a washing machine and dryer are also located there is a matter of taste, but probably more practical with three children. So then swap storage function with office/guest. Consider whether parents should be at the very top, with the children's level in the middle.
You must walk through an elongated pantry; an advantage would be a square layout for the pantry. Door, left, right, and opposite then shelves, so you don't need to go inside but can reach everything from the door. Bathrooms always stacked (as already mentioned).
And always keep in mind: a sealed roof terrace costs money. Whether you use it when you have a garden is something to consider (cost/use factor).

Best regards

Ok, variant 2 is already not great in the layout ;) The basic idea was to separate the private area from the public area.

The hallway is really quite large, here too we need to consider where we can save space. In any case, we want a quarter-turn staircase; maybe we should therefore place it closer to the entrance... however, I've already tried to shift it a bit and still end up with a fairly large rear corridor if all rooms (WC, utility room, and storage room) are to be accessible. But I will keep puzzling until I put something together. :)

Storage room and office can and probably will still be swapped (in the 2 1/2 story variant).

Oh, and regarding the roof terrace: Our architect said that a sealed flat roof or a sealed roof terrace does not make a big price difference, so we planned with the roof terrace. We will probably not use it much. Therefore, we are still open about that.

Kitchen, dining area, and living room should definitely all face the south side, with the extension for the living room as a screen from the driveway - as there is undeveloped open space on the east side. Not so simple, but that’s why there are architects who know what they’re doing.

Another opinion that gives me goosebumps. That you don’t hear any impact noises in current apartments is no reason to run the bathroom drainpipes through the living room or dining room in a new building. The plans are wonderful at the draft stage and in the euphoria of building a house, people overlook such supposedly harmless issues. At the latest when the executing company, due to ignorance or a human error on site, installs a defect and impact noises become audible, the planner/architect will be held liable. Then people look for someone to blame and never the mistake in themselves. I have experienced this many times and I make a wide berth of exactly these kinds of clients as a planner and as a construction company. I think the first pictures are fine, but the bathroom has to go somewhere else. BASTA! hinders few clients from later suing the architect who designed the approval planning if

I think the dressing room (1. Grundriss) is not really usable. Put a 200x60 cm wardrobe in there. Then there is no more space inside and the window can no longer be opened. Ok, it will be sufficient for a few simple and open shelves.

I find the 2. Grundriss much too convoluted.

Once again an opinion that gives me goosebumps.
The fact that you can't hear any falling noises in the current apartments is no reason to let the bathroom drainpipes run through the living room or dining room in a new building. The plans are great now in the design phase, and in the euphoria of building a house, one overlooks such supposedly unproblematic things.
At the latest, when the executing company installs a defect on the construction site out of ignorance or human error and falling noises become audible, the planner/architect will be held liable at the latest then. Then people look for someone to blame and never the fault themselves.
Experienced many times, and I deliberately avoid such clients as a planner and as a construction company.

I think the first pictures are okay, but the bathroom has to go somewhere else. BASTA!

hinders few builders from suing the architect who designed the approval planning later when

The bathroom has to go wherever it fits! In our future house, we have two bathrooms upstairs and no option but to let the drains run through the living room. If it is done properly (like in our old house, for example), it's no problem (if not, the company responsible has to do it again - proper inspection is always an advantage). Therefore, unfortunately a nonsense and unrealistic response!
Sorry for the drastic wording!