Oh, you wanted it as a private holiday apartment, I thought for rental as a holiday apartment. Then I would also allow myself a somewhat more luxurious bathroom.
Kitchen in the bay window: as far as I can tell, the water pipes are rather where the wardrobe is planned. Is it even possible to place the kitchen in the bay window then? I thought connections should remain as they are and in the original plan the sink is drawn where your 550m line is now.
It would be helpful to know at least where the water pipes are (supply and drainage), if they are not to be changed.