Lime plaster and lime paint or something else - new construction

Not necessarily, you're right about that. But we still don't like the surface. The rather "sandy" look of the lime plaster is more our thing...
It's all a matter of taste anyway!

Yeah. That's why we still need to find a master painter/plasterer on the list who can also show us samples. OK. So it remains with normal plaster and the system.

Thank you for the information.

Now, let's continue.
Since the controlled residential ventilation with heat recovery is supposed to be so good, what about washing clothes in the apartment? We would have an internal storage room for this purpose. There is still the possibility of installing a skylight for just under 7,000 euros.

Does that make sense? Or will the moisture generated during drying be just as well removed through the heat recovery and controlled residential ventilation?

Roof windows do not make sense to me for moisture removal. Daylight is, of course, a different matter. For example, you cannot open the roof window in winter and rain or only for a few minutes a day. In summer, the outdoor humidity is often so high that opening it would also be disadvantageous.

Since the controlled residential ventilation system has been in operation, we have kept all windows closed and only opened them for cleaning. Only in the bathroom do we briefly open the window + roof window after my wife has taken a hot shower for 15 minutes. However, the humidity in the bathroom then reaches 90%. By the way, we have never used our clothes dryer since the controlled residential ventilation system has been running. It will be getting thrown out soon.

Of course, good planning of the controlled residential ventilation system is important. Exhaust air should be extracted from rooms where moisture/odor is generated (bathrooms, kitchen, and also a laundry room...). Supply air should be delivered to living and sleeping areas. In our kitchen and main bathroom, we installed double exhaust ducts.

wow. thanks for the great input. then we can skip the skylight. The laundry room/guest WC can also have a window. My concern was only the moisture, but if that is removed then the double exhaust should work. Thanks

One more thing about the controlled residential ventilation: Can it also handle odors from the bathroom/WC area? Unfortunately, I can’t think of any other way to describe it, but the smell is also quickly removed?

Yes, of course. That can't be done instantly in a few minutes, but of course the odors will be eliminated. The higher the ventilation level, the faster.