Hi Sam, The obvious comment is not to go too dark. Don't be scared to go for big tiles. We use big tiles in all our projects and in the showroom and doesn't effect it what so ever. I believe the bigger the better as there is less grout lines (and less to clean then). Maybe think about going for rectangle tiles for the floor and brick bind them. This way the grout lines can be positioned to make the room feel longer (like the picture I've attached). Please feel free to contact me if you want more advise on tile combinations. Regards Stephen Newton

We have done a few of these, more than happy to advise if you wish.

Yes but I think we decided to try and fit the vanity on the small taller wall where the side door will be. It seemed odd not having a mirror above the sink but then we have a big empty wall opposite the short one that we could have a mirror and a shelf for doing hair etc so I'm debating what to do now, haha

A freestanding bath (filled) might be too havy for ceiling joists. Got that checked too? And where will your soil pipe go? A floorplan (both floors) could give you more and better answers.