How to tile the bathroom? (Appearance)

We have floor-to-ceiling simply because of cleaning!

For that, [75x25] flows and is laid without offset!

We have floor-to-ceiling simply because of cleaning!

But honestly, once the plastered wall is painted, what is there to clean?
That wouldn't be for me, especially in such a small room.

They are supposed to be very light concrete-look tiles in gray, with dark gray wooden furniture -- similar to the 3rd photo - only the tiles lighter.

Personally, I find that a bit too much gray (and I love gray and industrial style), but too much is too much.
I would therefore tile up to the height of the stud wall, so about 120/130 across the width of the toilet and washbasin, or pull the tiles a bit higher, around 140/150.
However: Give the cabinet a warm wood tone and reflect this in the shower tile. Paint the other two walls neutrally in warm white.

We have tiles up to the ceiling simply because of cleaning!

Oops! Tiles need to be scrubbed from time to time. Painted plaster doesn’t. So have fun stretching.

According to your statement, "Dreck" also gets on the tiles, so "Dreck" also gets on a plastered wall. So it's better to clean the tiles than to repaint.

Are those Villeroy & Boch tiles in the third picture?

Thank you, I still have problems with s and ß and ss, German language difficult language