Stress-free building - Who has tips or experiences on how to do it?

... don’t think of the beige Bahama bathrooms of the 80s, but always aim for timelessness. White tiles, earth-colored floors, white windows, that is ALWAYS modern, ....

Yes and no, show me any bathroom from the last 50 years and I can tell you with 90% certainty which decade it’s from. There is no timeless. My parents thought that 25 years ago too, but unfortunately that doesn’t work out. I don’t believe that walk-in showers without shower trays including built-in or clear glass partitions will still be considered "state-of-the-art" in 20 years, just like the T-layout and privacy panel. Then there will be something "new" again or an old trend will come back into fashion.

The fully glazed window fronts are (for me) just as much a temporal phenomenon as conservatories were in the 90s. I believe that one day some will be happy again about space for sideboards, more sun protection, or less window cleaning. In my opinion, the concept of open kitchens is already strongly declining again. And many perspectives, in my opinion, also change with the presence of children. Without children, I find the concept of a very open design brilliant. When I think about my teenage years and the volume of my stereo system, however, I can understand why my parents would have liked to have a few more doors or why my father wasn’t unhappy about his office in the basement.

It's like with fashion, it constantly changes, often looks bad, everyone does it anyway, and then something else comes along again. Here, model home parks and magazines probably also set the trend...

above all, the topic of open kitchen - dining room - living room is already strongly in retreat again. Most at least separate a room from it or put doors in.

Exactly, I believe most people want to plan timelessly (except maybe for wallpaper and furniture), but in reality, that is impossible. Just go to a furniture store and think about how many pieces of furniture were already there 10 years ago. That is at most 10%.

We recently visited the original apartment and practice of Sigmund Freud in Vienna; the Freud family operates it as a small museum. Both in terms of layout and spatial arrangement as well as the design and furnishing, nothing seemed embarrassing or even a no-go. Only the bathroom would certainly be larger and different today. Timelessly possible. Karsten

is probably a matter of taste as well, I find some things rather terrible (when I look at Google images where, of course, you can only judge the furnishing and color scheme)