From the airport you take the lines S 1 or S 8 to the central station (Hauptbahnhof)
were you change into the U-Bahn number 4 or 5 (direction Westendstrasse or Laimer Platz).
After one stop (Theresienwiese) you get off and take the exit to "St.-Paul- Strasse".
After leaving the escalator you turn to the right, walk up the steps and there you are
directly in front of "Hotel St. Paul" !
The ride will take about 40 minutes.