Personal preference:
3 big bedrooms
1 big living area
Breakfast bar
Downstairs tiles. I love wood too, but tiles for maintenance.
Laundry door.... huh. Stumped as you are. Garden exit is probably good if you can do it. But it wuldn't top my priority list.

I currently live in a duplex. The thicker and heftier the wall between the two places, the better. I am over it.