This cute postcard was postmarked in Vienna, Austria. I can not read the date but I did a little research on the stamp used.
It depicts Emperor Franz Joseph and had a value of 5 heller. Granite paper with varnish lines Lackstreifen in 1904; without after November 1905. Valid only until 31 October 1908. It was also used in the Levant post-offices. So I guess the postcard was posted between 1904 and 1905.