200 m² maisonette in an existing building, interior (almost) fully customizable

Interim question:
Do you really want to use the entrance door on the upper floor as it is?
And how is the access to the rooftop terrace intended?

The kitchen would have to work independently of the backup kitchen

Currently, there is not enough workspace available.

However, my wife thinks that then she would be working with her back to the window and casting a shadow on herself.

Therefore, my suggestion is a long work line under the windows..

Also, the view of the kitchen from the living area could appear more "harmonious" if the island is not at a right angle to it. Valid objections?

Well, your part is shaped in the north by sharp angles, almost a slanting wall. You have the choice to highlight exactly that, which also supports individuality.

Without a platform, this will not be resolved,

The platform can stay. The step from the living room is the trigger here, not the staircase itself.

a spiral staircase is out of the question as the main route for us.

I would never suggest it either, since it isn’t even allowed ;)

I would never suggest that either, since it is not allowed at all ;)

It would be allowed. There is an exit to the stairwell above. That means an escape route is available.

Hm, I can imagine the problem with too little workspace. Although theoretically, you could make the island a bit longer. Now the question is whether it really has to work 100% without a backup kitchen.. :oops:

Turning the island 90 degrees and placing the work row under the windows would be an option, yes. But to ask stupidly, isn’t that too much workspace combined with a large freestanding island, or can you never have enough anyway..?

Showcasing the slanted wall, interesting thought. Honestly, the wall on the plan looks extremely slanted to me. I have stood in front of it quite often and it’s not noticeably slanted. Maybe photographing the plan caused some distortion, I will check again.

I don’t fully understand your suggestion about the stairs. At what height would the landing be and where would I come out at the top?

It would be allowed. There is an exit to the stairwell at the top. That means an escape route is available.

Yes, that's right. There is another staircase in the hallway.
But my question was also whether this door could simply be incorporated into a room. However, that does not change the escape route.

I don't quite understand your suggestion with the stairs. At what height would the landing be and where would I come out at the top?

Exactly as it is now :)

I will draw the home now!