In Budapest we will stay in a charming university guesthouse in the heart of downtown Budapest within walking distance from the BUES where lectures will be held. All rooms have a private shower, mini bar, telephone, and TV set. Iron and ironing board are available upon request. Lodging in Prague would be similar to Budapest. How much one spends in a trip like this is a highly personal thing.
Some students simply spend more than others.
You can spend a lot more in Vienna than Budapest, simply because Vienna is a very expensive city. Having said all of this, it always is a good idea to have a credit card with you. They are widely used and you get the best exchange rates using them. You may be charged a cash advance fee or ATM fee, depending on your bank, but you still come out ahead when you use your credit card and ATM cards. It takes about four to six weeks to obtain one.