As stated above, Shower curtain is there included and 1 roll of toilet paper. Since I lived in single room les prince I would suggest you buy cleaning supplies (windex, lysol spray, lysol wipes etc) I would also recommend glade flameless candle in the washroom to make the washroom smell good all day!
I also put a plastic drawer organizer (3 drawer) in the washroom and I put all my extra towels on top of it.
Good luck
EDIT: I found these pictures that I had saved long time ago
Ugly Curtain ha?
P.S. flooring is according to your floor number
Floor 1 = Red flooring
Floor 2 = Orange flooring (like the one in the pictures)
Floor 3 = Yellow flooring
Floor 4 = Lime green flooring
Floor 5 = Blue flooring
Floor 6 = Grey flooring (even though the theme of the floor is purple, the flooring is grey)