I hope this help you:
- accommodation from 200 euros (it's more expensive in the center of the city) to rent an apartment, plus the expenses (from 60 euros, it depends whether you have cable, internet, etc.)
- public transport (monthly ticket is around 30 euros)
- monthly budget for food is from 350 euros (again, it depends on what type of food you like to eat) I recommend at least 400 euros budget for two people.
- elementary and high school education is free for Serbian citizens (colleges enroll certain number of students for free, while others pay for scholarship)
- cinema tickets are from 3 to 6 euros (it depends on the day, the movie, whether it's 2D or 3D...)
- coffee and drinks are from 1 euro, while it's a bit more expensive in the center, where you need to pay from 3 euros for coffee or drink
By the way, I'm talking about Belgrade.