Large format bathroom tiles are great. There are less cuts and less grout which means less cleaning. However you do need to be careful where you use them. You do not want to put a large format tile into a small space. You would want to use them on your walls – the largest space that you have.
Using a 300mm x 600mm tile run vertically up the wall creates a sense of height in the bathroom. So if you don’t have high ceilings, this will help create the illusion of height for your bathroom.