Type of tile installation

Hello
We are building a house with a general contractor. Various things went wrong during the tile installation. I would like to know what I can demand to correct these issues properly.
1. We wanted a niche in the shower, and this was also promised to us. All grout lines were aligned to the niche, and the tiles (45x90cm) were cut accordingly. Everything was discussed on site with the foreman. The walls were fully tiled, and then the tiler called me to say that he couldn't make the niche because it is a concrete wall. He tried, but it was not progressing; the concrete is too hard. My question is, isn't it his responsibility to check this beforehand (to study the plans he received from the general contractor) to see if it is even possible to create a niche where we requested? Unfortunately, the grout lines now fall so awkwardly that it is not possible to create a niche on the other wall. It would look even worse. Can I demand that he does create the niche in the concrete wall after all? Is it technically possible?
2. The baseboard tiles were laid so that the name of the tile (brand name from the manufacturer) can be read on top of the baseboard tile. Isn't it usual to make sure this is not on top? It was not planned that the baseboards would be painted. Is this a mistake? Can I complain about it, or does this sometimes happen?
3. Regarding the installation method, we defined that everything should be installed with a cross joint. Floor and wall with the same tile 30x60cm in the first bathroom and 45x90cm in the second bathroom. In neither bathroom was attention paid to ensuring that the floor joints continue up the wall. It looks very strange. It was also not properly explained to us during the meeting what exactly the tiler intended. We have now demanded that they re-lay the tiles on the shower wall. He made an offer for this at cost price. Is it realistic that he is offering the following at cost price?
- chisel everything away
- reseal (apparently the sealing will be damaged)
- re-lay
- have tiles delivered
Total: 2700.- CHF including VAT.
I would be grateful if someone could help us further here. It should have been my dream bathroom, and at the moment it is nothing like I imagined. I am very disappointed and want to know what I can reasonably demand to have the whole thing corrected properly.
Thank you in advance.

Hello,
it is difficult for me, as an outsider, to give advice here. The contract contents are important here; it is not clear who commissioned the tiler, the general contractor or you – this would determine to what extent you can make claims against the tiler.
If the general contractor is the client (which would usually be the case with a general contractor), you do not have a contractual relationship with the craftsman yourself and no right to make claims against him; you would have to turn to the general contractor so that he carries out the shower and tiling work in accordance with the contract.
Unfortunately, no more advice can be given for the time being.

Good day

Thank you very much for the response. In the meantime, someone has informed me that there should be a sanitary plan which should be signed by us. The GU never gave us a sanitary plan. Is that always the case? Should the joint and the laying method of the tiles really be drawn there as well? We have a contract with the GU, but it was said that we should directly determine the laying method of the joints with the tiles on-site. However, there was no official appointment where anything was recorded in writing. Can we hold the GU responsible for the bathroom being tiled incorrectly due to the missing sanitary plan and demand a price reduction?
Thank you very much

Hello again,
when building, a service is rarely "included." If you want a sanitary plan or a tiling plan that specifies the installation method and joint pattern, this must be agreed upon in the contract. Without written evidence that a specific installation method was agreed upon, there is hardly any way to prove this agreement. That way, hardly anyone can be held responsible.
Perhaps you should consult a construction lawyer about this; they can review the contract and also assess the agreement regarding the installation method; maybe there were witnesses who overheard this agreement.

Thank you very much