Statics with the ground floor could also turn out unfavorable... All floors have vertical walls, ground floor has a non-load-bearing horizontal one with 2 possible supports.
Laundry chute through the children's room? Should the children have no possibility to throw their laundry in there? Afterwards, carrying all the laundry back up 2-3 floors. Washing machine and dryer in the storage room on the upper floor.
The long hallway has no function except to get to the toilet, and the two small rooms at the back still offer potential...
A rough furnishing for the large living area would be helpful.
Otherwise, congratulations on the property, looking for existing buildings or property in the Taunus and that really isn't much fun.