Husova street at Old Town.
I once ordered a dvd at a webshop and chose option "pick up at our store at Husova street". I went there the second day, walk through the street several times unable to find the store. Well, they have Husova street in Brno, the second biggest city in the Czech republic, about 200 km from Prague, too :) Friend of my father's friend had to go, pick it up and a month later gave me the dvd on her way to Prague.