I have recorded it for myself, and it is barely enough. I have been drawing floor plans as an amateur for 20 years… some even make it into the selection to be built "exactly like that" or approximately. A design by laypeople is redrawn by professionals who are not fed with ideas. Usually, bottlenecks with real dimensions appear; there are stairs that do not function according to regulations, the stone dimensions or grid always mentioned by . Doors whose installation does not work… forgotten plaster thicknesses. What I want to say is: Always plan enough space (and also height) for detailed planning. Many things depend on each other and especially on the stairs. If you already draw tightly now, it will probably not be implementable as is.
Your Raumwunder kitchen: with a kitchen island 90 cm wide, you have 80 cm aisles (assuming your drawn dimensions are without plaster and built-in bulk). That will not work well in everyday life. Opened premises, oven, or cabinet doors will block. The interaction will be cozy, and you will possibly walk more rounds than you like before having to nudge the other person. The hallway is not large. A space for a dresser is missing. It will probably shift into the living room area, where there is useless space, practically an anteroom. The sofa furnished like this is in the focus of postmen, etc. Retreat is not possible in this line of sight. I would therefore place the stairs slender and somewhat more centered and also consider whether not to integrate the carport/parking space into the ground floor with a corner. That would do good to the look and the window façade on the southeast.