We have just finished a bathroom reno, using a builder.. not doing it ourselves.
Our ensuite bathroom is 1.1m wide. We used 30x30 tiles on the floor, and 90x30 tiles on walls. I think it looks great. Floor tiles are large enough to look modern, but not so big to have problems with fall in shower. There is one tile section which is cut around the drain, but they've done a very neat job.
We also have a frameless screen in the bathroom. In terms of the building work, you need to plan exactly what size the shower screen will be before you tile. The builders laid out a section of metal around the perimeter of the screen and tiled to and from this point. Actually, it helped cover areas where the tiles wouldnt have joined perfectly to the wall tiles. This is where the little metal strip at the bottom of the screen goes. But they were very fussy about getting the exact size of the screen and positioning of doors etc right before they tiled.
From a practicality point of view, there is some spillage out of the shower into the bathroom, particularly through the gap between the door panel and the fixed panel. This is partly due to our shower being a bit narrow. But they do look fantastic!
We didn't end up using one of the shower screens we bought for the job, so I'm looking to sell a 900 x 1200 frameless shower screen if you are interested! 10mm thick glass.
Pen