Another version without tapering the kitchen, which in my opinion offers more spaciousness and room. Access to the technical room through the kitchen has the advantage of also serving as storage. Laundry chute in the bathroom is conceivable.
Children’s room increased to 15m² without significant losses in other rooms.
Chimney almost optimally located in front of the roof ridge.
I would not set the fireplace back, so that it breaks up the wall. Personally, I like fireplaces that still have a small bench in front of them, which protrudes outward. The cat could lie there wonderfully.