Bungalow floor plan 160-170 sqm with basement

Looks like the floor plan of the Palace of Knossos again. :) Or those labyrinth games with the little metal ball.

I like


best ... in the other variants, one children's room has exclusively west-facing windows, which means less light in winter.
And, I also like the main terrace in the southwest better... very pleasant on nice summer evenings.

If you really insist on having a basement (I understand, the look), then think carefully about whether it should be a full basement. Then also whether it should have daylight or not. That makes a huge price difference. Sauna room and technical equipment are stored in a small space. An office (which you had planned above) would make sense downstairs, and if nicely furnished it will also be cozy there. A guest room with a small shower bath also doesn’t take up much space. I come to about 70-80 sqm. You can then still consider giving the office and guest room daylight through light courts. Always keep in mind that light courts take up a lot of space. I don’t find them particularly nice either. I think a separate basement entrance belongs to every basement. If cleverly divided, you could save yourself a light court.

I would really recommend planning all relevant rooms (bedrooms and children's rooms, guest bathroom, main bathroom, storage room) upstairs. The rest downstairs, and where there is still some space left, you can get good additional storage areas through cleverly planned cupboards.

I had spoken of an idea "a la Vita, Weiss" and also put it into practice:
Of course, I also had the desired basement in mind... but I have to say that it is quite difficult on the ground floor, i.e. a bungalow with so much space, to create in the "middle" of such a space-consuming house something where you don’t end up with endless corridors or dark niches. In the basement everything is unsatisfactory. The rooms are dark inside, even though there is an enclosed light well and a panoramic window. An apartment there would only be possible with a struggle, and then only with closed eyes.

Well then: I succeeded in an initial approach. Everything stays under 15 meters side length. I didn’t pay attention to the area anymore... and also light wells, the basement terrace mentioned by the original poster (OP), I no longer see feasible with the floor area ratio. The house in terms of area practically takes up the entire plot: 3.7 or 6 meters in front and on the sides (light height also requires boundary distance) mean that there’s really no garden left.
I’ll spare the details on this – the other discussants know about such a problem – ultimately the OP has to know how he positions the house on his property.
The only thing I logically moved is the terrace to the southeast. Since it is covered, at least it is protected from the wind here, a southwest terrace would be windy and the covering would also be of no use. Besides, I wanted to do the children a favor with the west side :)
But basically the designs could be countered, the garage could also be moved from west to east.
Much depends on each other, so moving this and that is usually not possible without something else no longer working optimally.
As far as I understood, the children do not need their own bathroom?

Here are the designs. Note: interior walls measure only a sketch-ready 10 cm, the exterior walls 38 cm. The kitchen island is 2.40 m long, the bedroom windows 1.80 m wide, the panoramic windows measure 3 meters.
North is, of course, at the top ;)
I’m still here for any questions :)
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Yes, everyone praises their own. Here you are most likely to find builders who say it wasn't optimal. Walk through the apartments and houses with open eyes. At your in-laws, the tightness at the dining table annoys you, at your buddy's you like the guest bathroom, the small distance between bed and wall in the bedroom bothers you, and yes, your cousin has to stand sideways to get to the oven. Take that into account, make notes. Diplomatically ask, of course. Wow, your guest WC is so compact, what are its dimensions? You don't have to say "It's so tiny, every time it bothers me that I almost have to climb over the toilet for the door to close and no one can wash their hands at the tiny sink without getting wet." Everyone understands that you need a feeling for measurements and dimensions.

I just fear that the floor area ratio will throw a wrench in your plans. Bungalow, garage, terrace, light courtyard, outside stairs – that adds up.

Bedroom facing the street shouldn't be a problem. At least in our house you don't hear much of it and we live on a main road. Garbage truck and refrigerated truck at the bakery are the noisy candidates.