Floor plan question, garage, stairs

I would reconsider the open staircase. Storage space for coats, pull-out shoe cabinets, etc. can be better realized under a closed staircase. And you don’t have that much storage space for 4 people. Regarding brightness, I would rather consider lighting with motion detectors for the staircase and hallway.

Kerstin's tip is not wrong - take a look at the attachment ;)

Rhenish greetings

Stylish! An open staircase also lets a lot of dust fall on the things below and often looks messy when you have an open wardrobe there

Thanks for the answers!

The following questions are still on my mind:

Stairs: Open or closed, good question. The pictures from Bauexperte also look very nice. What does a closed concrete staircase look like if nothing has been installed under the stairs yet? Could the hallway possibly feel too cramped if there is a closed concrete staircase? Our staircase is 2 x 1/4 turn, I lack a bit of imagination as to how it could look with a closed concrete staircase.

Floor-to-ceiling windows upper floor: Facing east (i.e., in the bathroom and in a children's room) there are no floor-to-ceiling windows planned in the floor plan. We are uncertain about this. From the interior perspective, of course, it is much nicer with floor-to-ceiling windows, especially in the bathroom we like it extremely well, but towards the east our neighbor is about 6-7 meters away. How does one realize privacy protection in the bathroom? Frosted glass? Pleated blinds? The privacy issue is initially independent of whether the windows are floor-to-ceiling or not, so we can also take floor-to-ceiling, right? How does it look in the children's room, there is already a floor-to-ceiling window in the gable, facing east also floor-to-ceiling or better not?

Light in the hallway: There will definitely be a double casement window, daylight spot, or something else, thanks for the tips regarding this!

Best regards

What does a closed concrete staircase look like, if nothing has been installed under the stairs yet? Could the hallway possibly feel too cramped if there is a closed concrete staircase there? Our staircase is 2 x 1/4 turned, I lack a bit of imagination on how it could look with a closed concrete staircase.

Is it definitely going to be a concrete staircase? Then it makes sense not to build it in underneath at first. I would also think for your hallway that the staircase might look too bulky as a closed element in the hall. However, a concrete staircase is already closed in itself – a wooden staircase is more transparent and even with risers airier than concrete.

You can later try out the difference between an open coat area underneath and a closed one. Simply hang the area with cardboard or boxes and let it affect you. Lightweight walls or paneling or cladding and built-in cabinets can always be added later if the coat area is not enough or looks too messy. It also makes sense to only build in under the high part of the staircase (top of the plan). For example, we also have that and a one square meter room that is exclusively a coat area for us. There is a coat rack on wheels as well as a shelf just for shoes and wall cabinets for scarves, etc. Current shoes are all on the floor.... a square meter fits a lot of footwear ;)

For floor-to-ceiling windows in the bathroom with a view from next door, I tend to prefer a normal window. Because you will almost always have privacy protection in front of it. And that way, you can possibly still accommodate a towel rack or something similar well underneath.

In the children's room, I would hint at the furniture arrangement. In terms of position, somewhere opposite would be the desk ... partly certainly in front of the window. There is just a point about "messy" cables or something, and blackout. If a desk is partly in front of the window, you can always only darken the lower area poorly, so a non-floor-to-ceiling window would usually be more practical.
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Stairs, I strongly suspect that you four will not manage with the cloakroom area in front of the "sewing room." Especially since a sticking point is that 275x150 cm is very tight space for the stairs. I have quickly sketched it with a floor height of 280 cm and a 90 cm walking width with a one-sided handrail:


If guests come, then that's the end. Therefore, you will probably very quickly occupy the area under the stairs, and the closed concrete staircase is simply more practical there. You could limit the installations to the area under the straight part. Then it looks airier.
Examples at
On Houzz.de "Solutions for a cloakroom under the stairs"
or
Tischlerei Frind, in your case the wall to the living area would be on the right ... the whole thing just mirrored