I'd go with a better company than the one we used. Our bathroom doesn't have a window that opens, so my one essential was to have a humidity controlled fan rather than one that only comes on with the light. The electrician decided (once the bathroom was fitted of course) that this wasn't possible as the fan outlet was next to the shower and it's a health and saftey no no apparently. They also failed to install the underfloor heating properly, so we ended up paying for that and not being able to use it.
Other than that, I'd go for a medium toned floor as our's is a dark grey and shows up limescale pretty badly. I'd also ask more questions about what brands of taps, heated towel rails the company provides as the towel rail rusted within a few months, despite us never using it to dry towels and the taps have never worked particularly well and need repairing every few months.
I do like the ceiling which is some type of pvc cladding with spot lights, sounds a bit naff but it makes the room look brighter and when we can wipe it down easily to stop the mold.