You could do a wet room on the south end of the room with the tub and shower combined to conserve space. Window would go above tub, however with privacy in mind it would not be low as you have in your cad drawing. see photo. Vanities would go on the west wall with toilet on the east wall. I am guessing at the dimensions because you mention meters and in the US we use feet, but it sounds like about 9'x15" ? The location of the entry door really impacts the layout of the room, but it looks like it cannot be moved.

Some inspiration, the last pic is clever with the bookcase, you would have a lip on the shelves to stop books falling off every time you open the door, but it sure serves two purposes

We're tiling our toilet room, which is only the width of the toilet with a small amount of space each side. I want tiles for hygienic reasons but am unsure whether to tile all the way to the ceiling on all 4 walls or only part way up...any opinions on what is 'on trend'? The bathroom in the adjacent room is tiled to the ceiling.

Live in NZ near Christchurch. Am trying to find an alternative to tile as a wall covering on the walls OUTSIDE of the shower areas. These are already acrylic as did not want to clean grout lines. Has anyone used any of the panel products on the market for covering the whole room? Has anyone found any to replicate LARGE tiles. James Hardie has hardiglaze but the tiles are small . I really like T&G panelling, again seen A Hardie product but would like a narrower width tongue. Also I think up to ceiling will be a bit much........pHowever what height to end it? Are there less ornate dado rails available? The house is a new build and the fittings are contemporary. TIA for helping.