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 September:
Tuesday to Sunday: 09:00 until 16:00 hrs

opening hours October:

Tuesday: 09:00 until 16:00 hrs
Wednesday: 12:30 until 19:30 hrs
Friday: 09:00 until 16:00 hrs
Saturday: 09:00 until 16:00 hrs

Entrance and cash desk at Josefsplatz:

Josefsplatz, A-1010 Vienna

Until further notice the cash desk is closed