Visitor center at Michaelerplatz in the Hofburg (under the Michaelerkuppel):

Michaelerplatz 1, A-1010 Vienna
Tel: +43 1 533 90 31-0
Email: office@srs.at

opening hours:
Monday to Sunday: 9:00 until 16:00 hrs
Friday, if there is a performance: 9:00 until 19:00 hrs

Entrance and cash desk at Josefsplatz:

Josefsplatz, A-1010 Vienna

opening hours (Tuesday-Friday, 9-12 hrs):
27.03.2018 until 22.06.2018
07.08.2018 until 01.11.2018
27.12.2018 until 30.12.2018

On days with morning exercise from 09:00 until 12:00 hrs