A szálloda 1918. októberében vált történelmi események színhelyévé. Gróf Károlyi Mihály itt megtartott szónoklatától számítják az őszirózsás forradalom kezdetét. A későbbiekben a hotelben rendezkedett be, az általa vezetett Magyar Nemzeti Tanács. Károlyi számára a szálló nemcsak munkahely volt, egyben ideiglenes otthonául is szolgált.

Hotel Astoria at 19-21 of Kossuth Lajos Street in Budapest on 31 October 1918. One of the important sites of the Aster Revolution of 1918, at the corner of Kossuth Lajos Street and Museum Ringroud. Count Mihály Károlyi, the emblematic figure of the revolutionary events, gave a speech here on the floor of Hotel Astoria. The hotel not only served as accommodation for him and his wife but was also the seat of the Hungarian National Council.

The Aster Revolution or Chrysanthemum Revolution was a revolution in Hungary led by Count Mihály Károlyi in the aftermath of World War I which resulted in the foundation of the short-lived First Hungarian People's Republic. The revolution was brought about by widespread protests as World War I wore on, from which Mihály Károlyi emerged as the leader of the newly proclaimed First Hungarian People's Republic that reigned between 16 November 1918 and 21 March 1919. During this period of time, he served as Prime Minister between 1 and 16 November 1918 and as President between 16 November 1918 and 21 March 1919.