S&S

In designing this studio, the layout of the spaces has been done according to your requests. The kitchen and bathroom are placed where you indicated. For the sleeping and living areas, I considered several aspects. The most important was to maximize light and visual openness.
In this design, I placed the living area next to the windows, and the elevated sleeping area after that. This way, the bed area does not block or reduce natural light from the windows, while still benefiting from its height. Next to the sleeping area, I placed the study space on the living side.(You can use a foldable study desk and add its chair to the living area).
Another point is the location of the access stairs to the sleeping area. These stairs also include storage drawers, and are positioned near the entrance. This allows the sleeping space to be considered more independent from the living area. At the same time, the stairs help cover the slanted wall. At the top of the stairs, I designed a full-height closet.
Under the sleeping area, I designed a walk-in closet, where you can store clothes and belongings, and also use a full-height mirror. Behind the bed, to make the most of the wall recess, I designed a large built-in wardrobe. The upper part has shelving for a lighter visual effect, and the lower part is divided into cupboards. Some are accessed from the walk-in closet, while one sliding unit is accessible from the living area, next to the study shelves.
The height under the sleeping area is about 140 cm, so you can easily sit on a chair or bench and access the storage. The bed area itself still has about 160 cm of height.
I also placed a two-person dining table next to the kitchen and opposite the sleeping area. However, it is flexible, and you can move it to the window side in front of the living area if you prefer. For this reason, instead of a fixed pendant lamp, I chose a movable floor lamp. Of course, you can also rely on the ceiling spotlights.
The kitchen is designed as a wall kitchen, similar to the photos you shared. In my opinion, an island would not be suitable, as it would block the living area. For a studio, a two-person dining table and a 3-meter wall kitchen are enough, especially since your main priority was to keep the spaces open.
The bathroom also includes a small entrance area with the laundry and sink. Beyond that, one side has the bidet and toilet. At a distance, separated by a half wall, is the shower area.
I hope this design is useful for you.