keep in mind that there are constraints in every building, especially those with several floors (electric, water, sewage, ...)
In France, if your plans exceed 150 m² (floor area) you must call an architect is the law.
level 0: why not open the kitchen on the living?
The living room would be enlarged.
The southern window of the room could bring a lot of heat, only one should be enough.
In addition there would be the noise of the parking.
level 1: the rooms seem (to me) well disposed.
I changed the balcony a bit to make it structurally simpler.
(red and blue arrow) and I move the black beam.
[s]level 2 and 3[/s]: nothing to add.
[:)]