Again there are several options here, ceramic tile, vinyl covering. However you cover the floor, do make sure there is a drainage point (Linear?) and that the gradient is a minimum of 1:100. 50mm Coving up the wall will assist keeping clean.
Links –
https://www.ccl-wetrooms.co.uk/technical/wet-room-technical-help-desk/wet-room-construction-details/
http://www.wetroominnovations.com/wetroom-gradient.html
http://www.advancedwetrooms.com/wp-content/uploads/2010/01/wetroom-foundations-leaflet-2010.pdf