Aluminium does under go oxidation, although it is white. Unlike iron oxidation which is orange. If the tile is designed for use in a wet area it is probably coated or anodised to prevent white oxidation. Check if cleaning will be a hassle (risk stripping the coating).

by "other options" i mean that you should consider all other options for locations of fixtures..there is already plumbing along each wall so swapping the location of shower and bath or vanity isn't as challenging as if there were no original plumbing in that area and if you plan to replace the fixtures and tiles rearranging the fixtures will only be a small percentage of the budget and it's a shame to limit the final result without at least considering other options..and although there is enough space to have the vanity hard up against the wall my suggestion is to have the vanity away from the wall to make it easier to clean and also because the small nook is an ideal space for hanging a hair dryer and with the luxury of so much space it will be easier to install a vanity away from the wall

Hi oklouise The sad part is the existing bathroom is beautifully finished! This whole house was well finished and really well built. It was sad to have to demolish things that were so well done, but the design problems made changes necessary. The bathroom has porcelain wall tiles floor to ceiling on all walls and a white polished porcelain floor (slippery as all hell, and a mongrel to keep the grout lines clean!) is laid over a full 300mm+ of solid concrete, under which are all the drains. Outer walls are 200mm of reinforced solid concrete. Tiles on internal walls are over cypress timber frame with generally two layers of lining glued, screwed and nailed on - and there is way more timber in the frame than necessary. I think the builder (who built it for himself) thought the house would last forever and would never need to be changed in any way. Exact distance from external door to wall is 1.1m on both vanity and shower side. The door combination is 1200 wide and placed dead center. It's worth noting that 300m on the vanity side of the door is full-length frosted glass panel and it's possible to infringe a bit on that area if absolutely necessary, provided there's enough room for the door to swing safely (as it swings toward the vanity. I will take some photos now and share.

In an apartment you need to check before you add floating floors. Some buildings have regulations to assist with noise control. If you keep the tiles, do they have the same under tones as the paint you’re considering using?- a clash between a cool and warm white will always look odd.