ᐅ Location of Kitchen and Living Room

Hello Forum,
I bought a house from a developer that is currently in the shell stage. The windows and roof are sealed, but no interior work has started yet. I have no influence on the plot (mid-terrace house), the orientation, or the construction materials. I can only choose a little during the interior finishing phase (sample selection – autocorrect wants to change it to "encourage"). Therefore, I did not fill out the questionnaire. Most things are not under my control.

I would like to share some thoughts about the floor plan. I have been debating for a while about the layout on the ground floor: where should the kitchen go, where should the living room be? And what about the "middle section" where the architect designed the kitchen?
On the upper floor, I'm not sure if I want to keep the huge bedroom as it is. Probably not.
The house is intended for me with my practice (1 consultation room, 1 waiting chair in the hallway) and possibly later (nothing is decided yet) with a co-houser. So, living together like students, but a bit more responsible.

The sliding door to the garden opens from left to right. Unfortunately, this will be my "main entrance" because the bike shed is in the garden. The bike is my main mode of transport. I use it daily.

The upper part of the ground floor plan feels too large as a living room. I live alone and don’t have a big sofa (a two-seater, a cocktail chair, a leather armchair, a coffee table 50cm x 50cm (20in x 20in)). Additionally, I play guitar and would like to have a permanent guitar spot with a music stand, preferably with some natural daylight.

Regarding the kitchen: I cook a lot and enjoy it. Currently, I have a double-row kitchen with a dishwasher island. It works great. But if I plan it in the upper part of the floor plan, everything becomes crowded. Then relaxed seating is only possible in the lower part of the plan with little light. Or I keep the kitchen as the architect designed it, in the middle section. Then I suddenly have plenty of space.

On the plan, up is east, down is west.

Does anyone have ideas for arranging the floor plan? Thanks in advance!

I also found a draft: kitchen on the upper floor (marked in red), living room on the lower floor (blue) with furniture (gray) and guitar area (yellow)

This is still a bit unclear. Where exactly is the practice supposed to be? Something like here?

Is there a basement? Where is the technical room?

The practice room will either be in the first room on the upper floor, on the right at the same level, or, if possible, in a small additional room that can be created from the "gallery" by reducing the size of the large bedroom. I am a psychologist and don’t need much space, but it must be separated from the rest of the house.

The technical room is on the ground floor, in the not-so-small central area ("berging"). The washing machine is also indicated there, but I would prefer to have it on the upper floor.
No, there is no basement. Only a small garden shed for bicycle storage, trash, and other items. The heat pump will be installed on the roof.

Hmm, well. It’s a bit tricky. I was just about to suggest demolishing the entire storage room. Even though I don’t think the floor plan is bad overall, the long, narrow hallway in front of the staircase would feel too dark and cramped for me. But if the technical installations are located there, the design is probably already fully planned, including wiring and so on, right?

Everything is fully planned. The wastewater pipes have already been installed, but adding something extra would definitely be possible. For example, the kitchen can still be placed in various locations.