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what do you think about the window front? Too fragmented? This insane subdivision from the development plan annoys me tremendously. What nonsense to prescribe a window separation after 1.5 square meters. Maybe we can negotiate that away. Otherwise, I can't think of any alternative solution.

If you initially accept the main structure of the granny flat as "given," I lack the imagination to change the layout in a way that addresses all the issues. Someone would have to roughly sketch that out for me.

Unfortunately, I have no idea either. But if you implement the kitchen in an L-shape as suggested by , there might be a possibility.

That would also mean that we would have to create a small area for a terrace there, right?

No, paving slabs are sufficient. It might be that you want to plant tomatoes or herbs again sometime. You could then harvest them on a short path. But garden maintenance is often done while cooking or between the 2nd and 3rd coffee in the morning.
However, I bet you will also set up a seating area somewhere in the garden.

Can you explain the open kitchen square to me? Does the square open into the living room and into the hallway? Where would you, as many have criticized, put the wardrobe?

There is a wardrobe. I am an advocate for wardrobes: 60cm per person! I don’t know what the others here are thinking, for whom or what a large wardrobe is supposed to be. What is drawn in should be sufficient for your purposes.
The symbol of a square with a circle is a washing machine.
I would probably design it open to the living area… possibly with a small peninsula and the table attached to it. You should ask your parents what they prefer. With an open kitchen, they benefit from the wardrobe window. However, as said above, with heavy traffic at the entrance in cold weather, it would also have disadvantages. If the parents don’t go for walks constantly or whatever, it fits as shown here for several weeks a year. And if an au pair were to move in there, it would also work. There isn’t as much coming and going there as with a family.

Do you think that the “new” WC you proposed is not too narrow?

I would try to squeeze out a clear room measurement (RBM) of 110 cm. There are great narrow WCs without windows on Google. I changed it again: the WC is moved forward so you can quickly go from the garden through the back hallway door to the toilet before peeing in the pool.
I noticed the window between the hallway and living room: how is that handled?

About the living room: how do you want to furnish it? From about 24 sqm on, it starts that placing large sofas in front of windows slightly offsets them. That looks more generous than a sofa that is pushed against the wall (as seen here). Where should the TV be? PS: many here see the placing of the sofa away from the wall and window differently than I do. I tell myself: if the room is made for it, then definitely with some distance.

Changes in blue :)

what do you say about the window front? Too fragmented? This insane subdivision from the development plan annoys me immensely. What nonsense to prescribe a window separation after 1.5sqm. Maybe we can negotiate that away. Otherwise, I can't think of any alternative solution.

I don't think so. I really like 1/3 2/3 and 1/4 3/4 divisions. Looks modern without boredom. You can also play a bit with asymmetry. Maybe that's why the house appeals to me positively. Where should the photovoltaic go?

I noticed the window between the hallway and the living room: how is it supposed to be handled?

I noticed that too. I would definitely not design the partition to the wardrobe with a glass wall facing the living room. And someone had already mentioned that the door from the wardrobe/hallway to the living area should also open differently. I would also position it a bit further down on the plan and maybe make it wider.

Here are some examples of how cozy mobile homes can be. However, most floor plans are usually in vacation mode for 4 people and feature a kitchen area in the "hallway." With comfortable furnishings, it is anything but a hallway.
The latter is the €200,000 Flying Space from Schwörerhaus, visible at Hausbauhelden.