Interesting idea to have the tiled floor/painted wall combo and the tiles in the shower match the wall colour but are different from the floor. The niche for storage works is practical. Would the walk in shower spread water all over the bathroom?
Simple in a narrow hallway. White painted stairs make them appear wider and the grey runner is both practical and elegant. Seek out a slim console - vintage or modern - thats useful and decorative but not space-consuming.