Nice of you to consider our personal taste
The main bathroom is 10 sqm, the guest bathroom 5 sqm, and that is okay for us. The important thing is that the rooms are big enough. Especially since the bathrooms aren’t really small compared to what else is offered in/around Frankfurt.
The tile format is deliberately chosen (and calculated) because with it we will have very few joints, and the bathrooms will look bigger. Yes, some tiles will have to be cut, so what? Should I accept more joints (and thus a less attractive look!) because of the extra work for the tiler? Certainly not!
Both walls and floors will get tiles, and brick-mosaic (made from tiles).