Thank you for the opportunity to work on your project, it was a pleasure, and I hope I've managed to meet your wishes and expectations regarding delivery.
As the proposal includes 3D floor plans most of the design is self explicatory, so I'll only briefly go through it in writing.
Level -1
As you enter the lounge on this level the space is organized diagonally following the geometry of the staircase. It's furnished with a two-sided sofa oriented towards the tv below the stairs on the side, and the fireplace on the other with a smaller seating section for a more cozy atmosphere. Towards the inside of the room is the dining area seating 6-8 people and could be extended to even more if needed.
The gym is simple, and since I did not have the information of what exactly your training routine is like, the equipment is just to get an idea of an option for a spatial organization with shelving in the niche and a tv on the wall next to it where machines that don't require full focus on the exercise could be placed.
The kitchen is very small but fully equipped with storage units drawn into the half depth of the staircase. This doesn't change the visual effect of the stairs and is not noticeable from the lounge side, but you gain more storage in the kitchen. The tall kitchen elements are placed on the shorter side with a built-in fridge and an oven on the longer side low elements with sink and cooktop and hung elements above.
The bathroom on this floor has a separate toilet part that is quickly accessible as you enter the room, and the pool and sauna with shower on the other side are elevated a few steps.
The bedroom is furnished with a large bed and built-in wardrobe with nightstands at the head side, and a floating shelf with tv and a seat on the other.
The studio is a conventional office space with a small seating section.
The garage is not very detailed since I did not have the information of what exactly would be done there if it's a workspace, so the layout is centered around workbenches in the middle and shelving units along the walls. (This could be designed in more detail according to your instructions additionally along with any other space in the house that is needed)
Level 0
The large open space is furnished as two lounge areas, both following the geometry of the space. One of them includes a dining area as per your instructions.
The kitchen on this floor is more spacious and fully equipped and with a lot more workbench area. A small peninsula is placed as an extension to the workbench and can be used as one.
The small studio has a desk and reading nook, while the larger studio open towards the lounge in part A is furnished more like a home library with an office station.
The bathrooms are both accessed from the hallway and similarly organized while one of them has a laundry station below the sinks.
The bedroom is very spacious and furnished with a large king-size bed, seating on one side of the bed by the wardrobe and walk-in wardrobe with maximized use of the space allotted to it.
If you would like to continue with the project in this direction, I'm at your disposal for any additional questions, or if anything else is needed.