We did the main bathroom and ensuite shower room 7 yrs ago. They have held up pretty well.
Good things: Very tall ladder radiators that also work as towel racks. These are very warming. We got dual controls, so that we can turn off the heating system and put these on electrically before bathing or showering in moderate weather. Very effective all around.
More storage than we thought we would need. Doing my makeup and brushing my hair in the en suite has made our bedroom much less cluttered and more serene. Keeping cleaning and paper products concealed in each bathroom is very convenient and improves the looks hugely.
A good, insulated bathtub
Showerheads on hoses in both bathrooms; the en suite also has a waterfall. The hoses make cleaning the tub/shower area a doddle.
Our porcelain tile walls and floors have worked well. The floors are nonslip and don’t get too cold. The grout was sealed and the walls have been easy to maintain
Small racks or rings for hand towels by the hand basin in each room, so they can dry properly (the radiators fill with bath towels) and you aren’t dripping water everywhere getting to them.
Problematic things: we also got built in shelves and they also puddle in spite of being sloped. Thanks to a PP I am now worried about water damage! We got fancy exhaust fans with retractable vents. They can and do malfunction. I wouldn’t bother. The builder thought he was doing us a favour by sourcing some obscure hand basins on sale. Turns out the porcelain mars easily. I would insist on a well known brand in the future.