Newly built semi-detached house 155 sqm - orientation & floor plan accordingly

If the is really like that, then place the house at the lower building limit. The entrance either at the front or at the side.

The private green zone to the north and also in the northeast may therefore not be built on? I would also consider placing the house further towards the southern building limit.

The street is a quiet residential street without much through traffic. With a parking space and carport at the front (+ fence or bushes), you would also separate yourself from the street, at least visually.

Yes, then that is certainly all doable. Our (opposite) neighbors also have their terrace on the street and a hedge in front. It works well. You can hear every word - but that doesn't matter. However, over the years more people have settled here and the traffic is increasing...
The carports then cast additional shadows next to the neighboring houses. You don't want to be disappointed in the end by the amount of light.

In the end, almost anything can be built. Even a staggered house with one north and one south terrace would probably be possible.

You can hear every word - but whatever.

Every word from the neighbors on the terrace?

The carports then cast additional shadows next to the neighboring houses. Don't be disappointed by the light yield in the end.

Good point, thanks!

Understandable, how would your floor plan look then?

No idea. Some designs are tricky. I would make sure the front door is at the latest in the bay window. And then present it visibly through walls or elements so that it is more noticeable. I would also visually block the passage to the north, because it is not good for Feng Shui. The sofa area can visually separate itself from the rest for me.

first 2-3 meters the neighbor’s house in view

Whoever first has the neighbors in view before enjoying their garden has done something wrong. I don’t think people without perceptual errors focus only on other gardens. Otherwise: counteract with striking elements or foliage.

Likewise in the west, here you also look from the terrace to the neighbor’s house.

You look where you want. see above.

Thus

I can’t see a thus. Just because you look somewhere doesn’t mean there is no shadow.

the east neighbor’s house shades the terrace of one half in the morning. We examined this more closely again in the reconsideration, because this does not happen with a building on the front boundary.

Yes, and? That can be. But it doesn’t have to be noticeable. You are currently comparing black and white. Your argument for black is that the white could or even will darken. There is simply no “miraculous” orientation that gives everything. Where there is light, there is also shadow. If you orient the main garden to the north, you might think about just mirroring the ground floor. However, in my opinion, the upper floor no longer works well. The children’s rooms should remain on the bright side. The staircase is rather inflexible because of the gable. I would probably also try here to get the entrance area into the bay window but lay out the ancillary rooms to the east so that the light from the south windows gets into the open-plan room. I can’t really say how I would design the floor plan spontaneously. Perhaps this is exactly the decisive point why the house belongs where it is now.

No idea. Some layouts are tricky. I would make sure that the front door is at the latest in the bay window. And then present it through a wall or elements so that it is better visible. I would also visually stop the passage to the north, because it is not good for Feng Shui. The sofa area may visually separate from the rest for me.

I would probably also try here to get the entrance area into the bay window, but place the ancillary rooms to the east so that the light from the south windows gets into the main room. I wouldn't immediately know how I would design the floor plan. Possibly, though, this could also be exactly the decisive point why the house belongs where it is now.

Exactly, I also can't come up with a good floor plan and would really be grateful here if you have a good idea for you how to design it to place the entrance in the middle.

Exactly, I also can't come up with a good floor plan and would really appreciate it if you have a good idea, for you, on how to design it by placing the entrance in the middle.

For which house location? Front or back?