Hello,
unfortunately, I cannot tell you the price of the shower, as we have this floor almost everywhere; we only worked with 2B floors (personally, I find such a floor mix horrible).
The shower itself also received an extra screed; that's what the specialist for the screed floor wanted.
Therefore, the kitchen/dining area/hallway/toilet/bathroom and bedroom all have the screed floor.
Children's room/living room and the platform in the bedroom for the bathtub have the old oak plank floor.
On average, you have to reckon with 100 euros plus VAT here, but it's worth it; the floor is amazing, I love walking barefoot on it, easy to clean, extremely good with underfloor heating, waterproof, and also insensitive. No edges, no stains, and if there are any, you just wipe them away.
Exposed concrete is a bit cloudier, which we would have liked better, but it did not meet our requirements.
Attached is an older

picture of the kitchen/dining area where you can see the floor quite well....