toilet, WC, water closet, loo, restroom, bathroom, john = toaleta (pomieszczenie), WC

WC

Source: http://www.tripadvisor.com/LocationPhotos-g187791-d285809-Stendhal_Hotel-Rome_Lazio.html

toaleta (pomieszczenie), WC

toilet BrE , WC (abbreviation) BrE , also: water closet BrE old-fashioned , also: loo BrE informal , restroom AmE , bathroom AmE , also: john AmE informal = toaleta (pomieszczenie), WC

English sentence and Polish translation

I need to go to the toilet. = Muszę iść do toalety.