Lake Neusiedl is a popular tourist destination for Austrians, the so-called "Sea of the Viennese" for all kinds of water sports and other recreational activities. It is also a cultural landscape worth visiting, especially the charming little town of Rust and the Esterhazy Palace in Fertöd, known as the "Hungarian Versailles". The site is also well known for its natural qualities, especially the almost Asian steppe areas and the birdlife, since many species from Europe have the easternmost point of their range here, and many Asian species their westernmost. Together with the natural reserves on the Hungarian side, the site is one of Europe's premier birdwatching areas. As far as I know, it was originally nominated as a mixed site for both cultural and natural criteria. Why UNESCO chose to accept only the cultural criteria, I don't know.