Hello,
Thank you very much for the suggestions.
There are a few things I would like to keep:
The location of the house should remain the same, (it has to, the plot doesn’t allow otherwise) and I want the main entrance in the middle.
I personally prefer an orientation more towards the west than towards the south (I work at noon).
Large apartment:
The utility room should stay in the old place: direct entrance from the intended parking space into the house (dirty entrance).
The bedroom should remain in the original place.
The rest is variable.
Note: Mother-in-law is already older, and renting out to outsiders is not excluded. (privacy)
Small apartment:
The number of rooms must be kept without making the living-dining area smaller. This will probably have to be tight :-(