Travel
Hungary is a Schengen country and visas are not necessary for travellers from other Schengen countries. From other non-Schengen Eurpoean countries a valid passport is all that is necessary. From outside Europe different rules apply but for most a passport valid for more than 90 days after departure date is sufficient. However check with your local Embassy.
Money
The currency is the Forint which is approximately 300 to the euro. ATM"s are available everywhere and take all normal credit cards
Electricity
220v 50hz standard european 2 round prong plugs
Health
There are no health concerns, but insect repellent is recommended
Weather/Clothing
We can expect it to be warm and sunny in the region of 20degs but with occasional showers. The best type of clothing is layers with some lightweight waterproofing.