Turn your living room into a basement with terrace and garden access and don't plan for rooms that aren't rooms. Think for yourself and not in the standard house style when it comes to the levels.
That's why rotate 90 degrees.
Just take a snipping tool and rotate the ground floor. Then compare it with the basement.
Save yourself the balcony. Price driver or not... that's a thermal bridge, it has to be wrapped, material always costs, needs supports, point foundation, etc. For that money, I would rather have the entire front glazed in the basement. And you still have space for windows on both other sides in the views of your design. So that's not an argument.
Edit: As I already said. You are too stuck in your ways. And that’s exactly what you’re doing to the architect when you go with this design.
Go to an architect, tell him what rooms you need, and forget the design. Say you can also imagine the kitchen/dining being in the basement if enough light comes in, and then let him work.
So something like this roughly the ground floor?UG The two children's rooms, hallway gives living, eating, cooking Would forgo the L-shape Possibly sliding door between living and eating if it’s too open for you At the back on the slope building services, storage room, stairs, WC
Ground floor entrance with stairs Parents, dressing room, bath possibly separate guest WC Children's rooms upstairs