Hello! I'll be in Vienna with my family from the 23rd - 26th. We have 3 full days there, although I know many places may be closed on the 24 and/or 25th. Any suggestions for must sees during these days, and what order to do them in? In general we'd like to see Schonbrunn, Christmas markets, and perhaps a choir/advent concert. Suggestions for a Christmas mass and restaurant reservations would be greatly appreciated as well!