Marking place!
I will add quite an obscure one:
Bette (bath and shower company) do baths and showers with an "upstand" built along the edge of the bath or shower tray. You tile down over the upstand. That means no need for the silicon strip which is the bit that always goes mouldy.
Also:
Full width carpet on the stairs, not runner. With runners, dust collects at the edges. Or wood stairs but that's noisy.
YY to larger tiles, underfloor heating, wall hung loo and basin, single mixer tap, built in doormats, walk in shower.
For bathroom pipework you have a choice: chased into the wall looks better and will be easier to keep clean, however it's harder to fix if it leaks, especially if you've tiled over it. Same applies to wall mounted taps vs basin/bath mounted taps.
Choose tiles, flooring and worksurfaces which have a bit of a "fleck" or pattern to them - so that every speck of dirt or stray hair is not on show. And avoid anything textured or carved as it will collect dirt (even just a simple Shaker cupboard collects dirt, flat fronted would be better).
Avoid wood in the kitchen or bathrooms.