There are several answers.
Zagreb- Croatia
Sarajevo- Bosnia and Herzegovina
Podgorica- Montenegro
Tirana- Albania
Pristina- Kosovo
Belgrade- Serbia
Skopje- Macedonia
** you may consider Ljubljana, Slovenia an answer but Slovenia is more east of Hungary than south.
Vienna is the capital of Austria
Hungary is an European Country, The capital of Hungary is Budapest.
austria
AustriaVienna is the capital and largest city of Austria.
Budapest is the capital of Hungary. (It is in Central Europe, bordered by Austria, Serbia, Slovakia, Ukraina, Romania, Slovenia, and Croatia.)
Austria
Hungary
Bratislava, Slovakia Borders Austria & Hungary
The Czech Republic.
Austria is that country
Slovakia
The country that shares a border with Austria, Croatia, Hungary, and Italy is Slovenia. It is located in Central Europe and is known for its diverse landscapes, which include mountains, lakes, and a small stretch of Adriatic coastline. Slovenia's capital is Ljubljana, and it is a member of the European Union.