I'm an American student who transferred into AUBG for financial reasons, and it was a great decision. This school isn't for everyone, but there's a lot to do on and off campus and the classes (though the options are limited) are generally well-taught and reflect the American liberal arts style. My favorite thing about this school compared to the one I transferred from in the US is how much is expected of the students here. There are several student clubs and organizations on campus, but unlike American programs they aren't meant to just pass time or pad the resume, you actually organize and manage huge projects and conferences. Students have a lot of responsibility here and are more challenged to develop socially and professionally than academically, which in my opinion is how a university should operate.
There are downsides to every university. The food here is deplorable, so either budget to eat out most nights or learn to cook. If you are an international student, especially from a country like the US or Serbia with a lower number of students, you'll find that freshman year students will naturally divide into their nationalities and forget to speak English, but this starts to go away after a semester or two. If you aren't used to Eastern European cultures, you should also be aware that administration and lifestyle here is disorganized and not customer-friendly. There isn't a lot of transparency in the university's accounting or operations, and you have to be really persistent to get answers to one question at a time, while in the US you can send an email with ten questions and have them answered by the end of the day.