sink/toilet combo For an absolutely tiny bathroom that is functional and luxurious, I would move the toilet/sink to the corner, along with the mirror, and add a rain shower on the right side, or as shown in the photo but with the rain shower in front.
Paris Grey limestone tiles for a durable kitchen floor. Light grey toned interior and exterior stone flooring. Image from residential property in Surrey UK. http://www.naturalstoneconsulting.co.uk/limestone-paris-grey-limestone