Opinion/floor plan ideas/two-story, energy-efficient house?

Oh, if the 1st floor is to be rented out to strangers, where can a washing machine and dryer be accommodated there?

Thank you already for the many hints! Some points we had already considered, but some were new helpful perspectives.

Regarding the question about our living situation: we are not yet in need of care, and age is always relative. We also want to keep the option open in the future to live in the house as long as possible. If, in the event of needing care, we really decide to give up the familiar surroundings, that would not be a problem. Converting a house later might not be possible, however, if it is not thought of beforehand.
When searching for a house or plot, we have also recently realized that houses are not so easy to find here.
How far it makes sense to prepare for the future probably deserves its own thread. :)

@ypg: Thanks for the hints about swapping the bathroom and utility room. We had not even seen that problem.
According to our local consultants, the pantry would be wheelchair accessible if the shelves on one side are removed.
We are still looking for the best place for a TV and the exact sofa location.

@backbone23: The lower bedroom is indeed not fully wheelchair accessible with a double bed.
If a wheelchair is needed, then the second bedroom would have to be realized. Then there would also have to be enough space for wardrobes, beds, and the 1.5 m turning radius for the wheelchair.

I do regret my naivety again ;) Well, I know someone who has built... fully aware of the fact that he has MS and will later need a wheelchair. I do not want to live in a house designed for a wheelchair user when I am young and also now in my mid-40s. You have to make too many compromises for that (also in your floor plan): living space too small, accessible bathroom instead of a feel-good oasis, wide annoying doors, and separated sleeping and living areas from the ground floor rooms by a staircase. Besides, it is very costly (150 cm of space where actually 100 cm would be enough, but a 13 sqm corner for the living room, which is not adequately furnishable for a family), which I would rather invest in things that give me comfort and quality of life now and today. If I see that you haven’t even planned a children’s room yet, then put your money into a solid and clever bungalow, but don’t plan the accommodation of a caregiver already now. The caregiver can, in case of emergency (worst case), be better housed in a front guest-study with a shower toilet. Enjoy life now! I recently saw a documentary about houses (NDR sometimes shows short reports about innovative and special houses). A woman, about 70 years old, had a wooden bungalow built with lots of height differences, i.e. staggered levels. Her statement about Barrier-free building: if you plan it, you get sick! She plans for now and lives accordingly – happily active!

I would not want to live for 30 years in an expensive compromise house just because care dependency might possibly occur at some point. You can think about this scenario when it happens. In particular, you do not know in advance what type of care dependency will affect you.

About the floor plan:
I do not think the two interconnected bedrooms/music rooms are well designed.
The living room is very, very small. No space for bookshelves?

After we spent some time dealing with barrier-free design, we find that a barrier-free building certainly requires more planning effort but actually hardly demands any compromises in the construction itself. On the contrary: we find the recommendations very comfortable for everyday life as well (wide stairs, no obstacles, storage space at the entrance, etc. - that's great!). Maybe our description gave the impression that we are already fully installing all measures (e.g. grab bars, etc.). Our point is only that we already live comfortably now and later would have the chance to easily implement additional measures. A large bathroom is barrier-free, but it is already a great thing under normal circumstances and can easily be designed as a wellness oasis. Even with children, a barrier-free solution is much more comfortable and maybe we really want to rent out the upper floor like that (it doesn’t have to be a caregiver :)).
So it would be interesting for us (in addition to the question of which orientation the kitchen should have) where you would see compromises. A few have already been mentioned and were helpful.
The living room is especially small because of the music room. If you combine dining + living + music room (open plan), is it still too small?