Floor plan change during core renovation of listed terraced house

it's only 115 cm.. I consider that too narrow, possibly possible if the shower is on the right wall, a small hand basin in the middle and the toilet on the left wall. But then the door would have to open outwards.

That was exactly my thought. The shower wouldn't be a "must" but would almost be practical in that narrow space.

I don’t find the gone bedroom bad. I find the enclosed office more impractical (maybe you need it as a guest room or another children's room sometime), I would give it its own access from the hallway.

Access from the hallway is probably possible, only I cannot move the wall between the dressing room/office because the window is in the way here. It might be possible around a corner, but then the dressing room would be without natural light.

Access from the hallway is probably possible, only the wall between the dressing room/office I cannot extend, as the window is in the way. It might be possible around a corner, but then the dressing room would be without daylight.

Oh, I see. Would it not be possible to install an additional window for the office?

I'm afraid that this way none of the rooms would really benefit from natural daylight.

Oh, there is the balcony. Then I would widen the dressing room towards the back up to the window. Space for a mirror, etc., maybe a dressing table. It depends on how urgently the office is needed.

Can you please add the cardinal directions? Where is the garden, where is the street? Which walls are load-bearing? Where are drains / where are connections possible? Is there a basement? Is a living kitchen excluded?

I don’t understand the balcony. Is it only on the ground floor? Somehow, I’m missing the access from the office.

Then I would give the dressing room a bit more space and give it the existing window.
What about the windows in relation to the [Denkmalschutz]? Would it be allowed to insert a new window for the office? Where the balcony is?

Upper floor: how high is the knee wall? I’m missing the floor plan here. When I hear that the neighbor installed dormers during the renovation, I fear that the rooms on the upper floor will be quite limited by the roof slope. A storage space must probably already be included. Are dormers possibly planned here as well?

How is the basement accessible? Direct staircase? Or via outside access? I ask because there is very little storage space – the wardrobe will also be rather limited. If the basement is directly accessible from the ground floor, at least shoes could be placed on the stairs during visits, for example.