For a fuller explanation of Soviet vacationing and tourism, you can check out an answer I wrote here.

Specifically for Hungary: Soviet international tourism was pretty much only group tours, and heavily favored "friendly" socialist countries. At least for the data I've seen in the 1970s-1980s, Hungary was near the top but still behind destinations like Bulgaria (which tended to be first place), East Germany, Czechoslovakia and Poland.

Tours, especially in Eastern Bloc countries, tended to gravitate towards major cities and capitals, because of that being where the major cultural and historic attractions being, that being where the international tourist infrastructure was, and not generally wanting foreigners wandering around the entire country. The USSR similarly allowed international group tours via the government agency InTourist, and these tended to stick to Moscow, Leningrad and Kiev, with a few other select destinations.