We've used a similar corner shelving unit to create space in a small 7 by 9 ft room. It's a great, easy shelving solution for small spaces (although installing it was a bit tricky as the walls weren't plumb.
For one day? maximize small bathroom space if you want separate shower and tub by putting tub against the wall, installing shower right next to it, and closing off the shower with glass. - My-House-My-Home