Eliminating odors and soot from a house with clay plaster - ideas?

The burnt smell can only be removed if the plaster is completely removed. And persistent musty odor would irritate me and cause me to take a close look at the structural timber in floors and ceilings. What is the floor construction on the ground floor?

From bottom to top: rammed earth, 30cm sand, beams embedded in sand without contact with the walls, wooden floorboards on top

OK, the entire clay plaster will be removed in the kitchen. How would you proceed with the rooms that only have a musty smell (but no soot or smoke odor)?

Such floors always smell slightly earthy and often have a problem with the beams. That all sounds like a terrible money pit.

Perhaps it is also interesting what your goal is. You certainly did not buy such a house with the claim that it would become a completely dry, insulated, and airtight new building. If you did, I unfortunately also see ’s money pit. Do you want to have your main residence there or should it only be a vacation home occupied on a weekly basis? I think that with this type of construction you will always retain a kind of humid climate, unless you build back on the foundation walls...

Yes, but I also wouldn’t want to inhale mold spores for two times two weeks a year. Completely chipping off the plaster and reapplying it is also far from a complete modernization to the energy saving ordinance standard.

Yes, but I wouldn’t want to inhale mold spores even twice for two weeks a year. Knocking off the plaster completely and reapplying it is still far from a complete modernization to energy saving ordinance standards.

Something definitely has to be done!! But if it’s only about mold, there are apparently good disinfection companies; it doesn’t necessarily have to all be redone.
For me, it was mainly about the probably persistent moisture in the floor and probably also the walls. That didn’t sound like a functional horizontal barrier, more like earth-moist walls... But I’m not an expert either.