Attic floor plan Your opinion

how much is appropriate? 1 meter?

Yes, they should be that.

there are still completely different distances too narrow, e.g. in the hallway by the chimney.
As Masipulami notes: in numbers... 40 cm between 2 kitchen cabinets, not even one cabinet can open :eek:
Break away from the current solution... the child belongs in the bedroom corner anyway, and a niche should be enough for a study room :)

Write down your wish list and room program and go to an architect exclusively with them. They will then plan it properly right away.