Parent bathroom + children's bathroom arrangements

I cannot say anything about the partition wall. The niche is probably not deep enough, I guess. Also pay attention to the supply line and how the connections are made; ideally, they are placed next to the position for the washing machine so that it can slide all the way to the back. Our washing machine is 64cm deep...

Kitchen Studio)
I recommend "Der Kreis" (Varia), which is also available in NRW; it is an association of kitchen specialists.
Hatching)
In many places, I would probably use gypsum boards in this area instead of building with masonry. Or drywall. Different material/construction = different representation.
Rescue Window)
The minimum dimension refers to the clear opening, which could already be tight at a rough construction nominal width of 101. Rescue windows do not have to face the street – but of course must be accessible by ladder, so practically usually again yes.

Good to know about the emergency window.
Thanks for the kitchen tip!

Does the floor plan have to state how high the built-in showers or privacy walls should be? They are not supposed to be ceiling height. No idea how high such a privacy wall is? But shower partition walls are surely 2m high enough.

The hatched walls should be intended to extend to the full room height; otherwise, heights should be indicated. Floor plans are usually designed as if viewed from a height of 1 meter looking down at the floor.

Could you help again, please?

Would you do it the same way or differently?
The window is not fixed yet. However, there should be a window on the side where one is already drawn.
There should be a tiled shower and 2 sinks or a double sink. Additionally, of course, a toilet and a bathtub.

Where does this variant come from now?