Renovation and floor plan design - Existing building construction year 86

In my opinion, the airspace clearly speaks against a second residential unit.
Otherwise, the partner's wish for a gallery was implemented. But that doesn't make sense with 2 residential units.

The issue with 2 residential units has been settled; we now want to live in the house alone and are focusing on the expansion of the ground floor.

Do you want to keep the fireplace?

The old fireplace is to be replaced by a modern variant.

Is the roof still completely undeveloped? I don't understand the red there.

The old floor plan does not show the truth; currently, there is a large room on the left and right as well as the WC. Only the fireplace and the thicker wall between the WC and Child2 are relevant because water/sewage are located there. The rest is all drywall or non-existent.

The red indicates the knee walls at the exterior walls and the walls in the middle.

The whole thing currently looks like this:

How would you optimize the floor plan so that the "all-purpose room" becomes smaller and a more efficient design is ensured?

It should not become smaller, it just doesn’t have to become bigger either. And/besides, there is hardly a better room for the bedroom than the one that was intended for it.

Wishes of the lady regarding this: -Open, modern, bright communal area (kitchen, dining, living) -Kitchen island

Work surface: island (2.5m x 1.2m)

And here I see a big problem: hooked by Pinterest and mainstream, it absolutely has to be the huge aircraft carrier… and I think you/you all will also force it in there by hook or by crook, although it probably rather takes something away from the room. Instead of adapting the island to the existing spaces, a pre-made idea somehow has to find its place in the room. The room itself also doesn’t have good dimensions or the proportions of the walls aren’t right if you consider the optimum. I’ll see if I’m still in the mood to do some planning in the evening – even though my attitude is more like “open to everything, I let myself be surprised, also gladly by more creative solutions.” Such a corset rather takes away the joy of planning from a creative person. Maybe there is a nice solution.

And here I see a big problem: hooked on Pinterest and the mainstream,

I agree with you 100%, mostly the ladies there are too enthusiastic about it and it comes to "I want that too"

I'll see if I still feel like planning in the evening – even though I rather have the attitude "open to everything, I let myself be surprised, also gladly by more creative solutions". Such a corset rather takes away a creative person's desire to plan. Maybe there's a nice solution.

That would be very kind of you. Also gladly a solution without the corset, as you already wrote we should be open for planning according to the circumstances. I definitely thank you in advance!