If you want the wall and floor tiles to be the hero in your bathroom I recommend you keep the vanity very simple. The white cabinet you have will be least obtrusive with a 'white' top. I love the elegance of stone and man-made stone is generally more durable. Check out Caesarstone Organic White or Frosty Carina. Although Frosty Carina has more pattern than Organic White, it's quite discrete so shouldn't compete with pattern on the tiles. If the tiles are charcoal or a dark brown/grey then either should work. Love to see a photograph when it's finished, whatever you decide.

Hi Craig, We are located in Melbourne and our showrooms are open! We have quite a few vanities that would suit your needs. We recommend this vanity https://fontaineind.com.au/alexis-750 or https://fontaineind.com.au/palazzo-900-freestanding as both would suit your bathroom! Goodluck!

. Colours scheme looks great. I don’t think there are any rules, but eclectic mix might be good for that vintage thrown together look. It may depend on how the fittings turn out and what you decide for sink and bench top. My thought would be to steer away from shiny modern taps. Here are a couple of pics for inspiration, one looks like it has similar fittings on cabinet to yours.

Yes I have Polytec laminate in both my bathrooms, powder rooms and laundry. Our home is nearly 7 years old, and the laminate is still looking good. Most vanity’s have quartz or stone tops, have you asked the supplier to confirm your thoughts about being too heavy for the floating vanity? A photo of my children’s bathroom.