The first place that Max Schranz moved into after leaving his family home is the kind that many young professionals dream of inhabiting at the peak of their career. At only 26, he lives in a bright fifth-floor apartment with high ceilings overlooking a European capital city, 10 minutes from the central station and within walking distance of cinemas, theatres and bars. No lottery win or parental trust fund was needed to make that dream a reality: Schranz, who is a master’s student, pays €596 (£512) a month for his 54 sq metre two-bedroom apartment – a fraction of typical...