Do you have ideas for designing our floor plan?

Jan has the problem that he needs an elongated building structure, the terrace not to the front towards the street, where the south is, but the living room there. Because if you position the living room in the west (with access to the north terrace), you don't get enough brightness into the living room due to neighboring buildings.

I can't say off the top of my head (I've dealt with it enough ;)), but how about leaving out the ceiling in a bungalow and getting light into the living room through skylights. It looks stylish, feels spacious, but the insulation of the slope costs more than insulating the ceiling, and there should be at least two Velux windows :)
Also google in the builders' diaries for my architect/construction company: they build individually turnkey and very close to you (Hanover)

Push the garage as close to the street as possible and move the living room to the garden side. Windows/terrace doors are then possible both on the north and west sides. This way, you get afternoon/evening sun in the living room. I don’t think that’s bad either, as I don’t want a terrace/living room with full south orientation where the sun shines in almost all day. Then in summer you'd need an awning or something similar for shading. If you both work, the afternoon sun fits perfectly since you’re not home in the morning and at noon anyway.