Hi Marcus,
an idea of the things I have learned so far.
Wood sticks burn hotter than big chunks of wood.
So I would imagine, as soon as you have your kindling burning, use some sticks to heat up and put a big chunk of wood on top.
I would also suggest a good flow of air, so that gases can burn as good as possible, and you won’t annoy your neighbours that
much. How old is your Kachelofen? Looks like the 1930s era with that classy double windows in the back.
