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The Auersperg Palace is mainly known to locals because it was here that Wolfgang Amadeus Mozart directed the first night of his opera 'Idomeneo' when he was not allowed to perform anywhere else in Vienna. It's also well-known here because in the later days of WWII, the Palais Auersperg staged an historic moment: It was here that in 1945, the Austrian resistance group 'O5' had its secret headquarters.
Visitors often learn of the palais through men in tacky historic costumes that sell over-priced tickets for classical concerts in Vienna.
The Palais Auersperg, which also serves as a hotel and houses a restaurant, is one of the venues where these concerts take place. The concerts are not the best quality in town, you will definitely find better alternatives, just make sure you refer to the Vienna ticket office in the center for further information.