District V is the heart of Budapest and the political, financial, commercial and touristic center of Hungary. The name of the district is Belváros-Lipótváros, which refers to the two historical neighbourhoods that is located in the district; Belváros and Lipótváros.
Inner City is the old town of Pest, while Leopold Town was established in the early 19th century, and became the political and financial centre of Hungary in the early 20th century when the Hungarian Parliament was built. The two neighbourhoods were originally the 4th and 5th districts of Budapest until 1950 when the two districts were merged and number IV was given to Újpest.
Wikipedia https://en.wikipedia.org/wiki/Belváros-Lipótváros
Coordinates 47°29'59.801" N 19°3'1.975" E