Floor plan design single-family house in L-shape

Thanks for the tip about the walls, I will try the program again later. I only played around in it for 3-4 hours yesterday, so I haven't found all the functions yet. It’s important to us that the toilets are separate, because of the smell and simultaneous use of the bathroom/shower. We want them separated, I’m used to it that way from my childhood home and had to do without it for 2-3 years in a rental apartment, which I found terrible. A large square on the plan is 1 meter, I thought that didn’t need to be added/mentioned separately. Yes, the living room is somehow a problem. We definitely don’t want too much hallway on the ground floor again, so a room has to serve as the main room/passage room, and I thought the living room was still the best suited for that. The wardrobe would be the small shoe cabinet plus 2-3 hooks for jackets. Do you need more than that? We don’t have a planner/architect yet. We plan to go to 2-3 people with our plan and, of course, have it improved. It’s just supposed to serve as a guideline so they know how big we want the rooms to be and what is important to us (for example, dining room and living room should be surrounded by a roof terrace, 2 bathrooms, etc.) Yes, maybe we will add a small sink in the toilet. At the moment we have none and always go from the toilet to the bathroom to wash hands. I will try to adjust the walls, but I don’t really have an idea how I can improve the floor plan, since we have a lot of requirements for ourselves and still don’t want to exceed 160 sqm of living space to keep it "cleanable."

First, please upload a site plan, preferably with contour lines, because 3.5 m over 15 m is not insignificant.
Is a building height of 2 floors fixed? Since it’s on a slope, does the basement possibly count?
I once made the following floor plan (rotated and mirrored for you ;) ).

Maybe it’s conceivable to put the children's room or parents’ area in the basement with garden access, alternatively dining/cooking/living, and then only have one floor.
Your current plan is already about 14 m wide and just under 11 m deep.

Laugh... No, not maybe.
A separate toilet gets a washbasin, everything else is yuck!
I’ll skip the details of the reasoning, as well as why anyone even brushes their little teeth ;)

Basically:
The more exterior surface, the more expensive the house.
Why an L?
A basement also makes a house more expensive. If a basement is planned, then you need a storage room for the vacuum cleaner and so on.
With a slope, you should consider how the basement can be used with external access.
How much should the house cost?
350,000 including ancillary construction costs?
300,000 for a house with a basement is not sufficient for your planning (L-shape, balconies).
On 160 sqm, many plan more living space than you actually have. A living room can hardly be used as living space at all.
What is the orientation of the plot?
Please note that - by a building line I understand something different than an area, namely a line.
Draw the cross-section of the slope on a squared sheet! Then you get a better impression, also how to use the basement or plan the ground floor. From this, the building shape results.

But even now in advance: I also don't like the placement of the living room. As ypg already said, it is a walk-through room and not a retreat. The office feels very narrow and long (this will be even more pronounced when the wall thicknesses are realistic).

I agree - but also the view that changes in the basis for discussion will have occurred after adjusting the wall thicknesses, or rather that it only actually exists then.

The OP is not yet at the stage where wall thicknesses are relevant. First, draw a rectangle with the property plus orientation and street, then a section with height indications; neighboring buildings would also be nice if privacy screening is already mentioned in the initial post. Sketches are meant to be taken out every day and improved bit by bit. Pencil and eraser are more effective for this than a program. A well-thought-out sketch may also take several days – in 4 hours you have something, yes... but nothing well thought out :) And then you can start with the exterior walls in the building envelope ;)

The OP is not yet at the stage where wall thicknesses are relevant.

Not drawn, but already taken into account in the calculations. At first, you can also just draw lines if you mentally subtract just under one twenty for the house width.