So... we started renovating our bathroom. Not very nice at all, thank you. We removed all the false walls and the false ceiling - and found dirty laundry as isolation material. Some mouse droppings as well. The picture below shows the current, stripped, room.
Things to be done: remove the old floor planks, check the floor beams, if necessary make them level, construct new false wals and ceiling - including redoing all the electricity, water and sewage pipework, and last but not least place a new shower cabin, bath, two sinks and some cupboards. And a new toilet.
One more thing: in order to place all these nice new bathroom furnitures, we (I) have to redo all the sewage pipes from the bathroom down to the ground floor, outside. Nice, nice.