I do not have any tiles in my current house but if you think about grout discolouring and looking bad.... then I think that might answer your question. My thought - the less grout the better.

I wouldn't do skirtings . I'd do the floor tile for '1 tile' up the wall ( assume they are 200 x 200 or 300 x 300 -- cut them if 400 or 600 ) . Personally , I'd probably even do the 'silver' tiled areas in that 1 height darker tile too , as it would make the whole room look more 'level' , but thats up to you and your tiler .

Hi there! I'm an Asbestos Assessor by trade and come across these a lot. In the UK these would be highly friable asbestos insulating boards, but here in NZ it's always pinex. No asbestos in these ceiling tiles :-)

Hi there, this is very touch. But you have discovered the base principle already, soft materials or materials with a lot of surface area absorb the sound. Just shooting out some quick ideas here for you: A soft and thick rag or bath Matt on the floor. Curtains are a good sound absorber, but not to much in a moist bathroom. Potential mold issue ;-) Another idea could be to hang bathrobes on hooks or a fabric laundry hamper onto the back of your door. If you find its still not enough.... since your walls are already tiled. you could do something on your ceiling... like a timber slat ceiling or a painted plywood paneling with holes in it. Make sure you use polycaprithane paint for moisture protection on the timber.... hope this helps. If there are questions or you need more help, feel free to send me a message. Cheers Gunnar