Nearly 90% have become less affordable, QS finds QS Quacquarelli Symonds, global higher education analysts, published today the 10th edition of the QS Best Student Cities rankings, which enable students to compare 140 premier educational destinations, including 30 new entries. London retains its status as the world’s best student city for the fourth consecutive edition. Munich (2nd =) shares its silver medal with Seoul (2nd =). Zurich…