Money
Visiting Serbia is a reasonably inexpensive endeavor, which should come as no surprise. This is due to a combination of the Balkans' cheaper cost of living and the lack of a coast like Croatia's, which causes costs to rise during the summer.
The Serbian Dinar (RSD) is the local currency, which is another plus for budget travelers. This is because, as a single currency, countries that use the Euro tend to be more expensive. Regardless, despite Serbia's status as a Balkan powerhouse, most goods are still reasonably priced. For example, coffee was frequently less than 1€ and never above 1.5€. Beer is also ridiculously cheap (around 1€), and lunches for 5-10€ should be easy to come by.
Finally, in terms of lodging, there are some reasonably priced private rooms for under 25€ (typically closer to 20€). Naturally, Belgrade will be the most costly city in Serbia in comparison to the rest of the country. However, in comparison to most other European capitals, it will remain affordable.