The a o berlin hauptbahnhof was opened in september 2010 the newly built house has very modernly furnished rooms and business suites the spacious lobby and entrance area with bar billiards and table soccer together create an inviting atmosphere with international charm the a o is in a central yet quiet locationin addition to the modern rooms and business suites the centrally located a o berlin hauptbahnhof has common rooms and conference rooms for relaxing and working the unique rooftop t