There's going to be a bigger ex-Pat scene in a larger city such as Zagreb and more English speakers.
I think I saw he'd "liked" what looked like a restaurant or bar recruiting for staff, so maybe he's going to try to get a real job. Something like that (which doesn't require skills / experience) would potentially work in a heavily English speaking area hence the bigger city. You'd really need language skills in a smaller regional city and the job potential and pay is going to be smaller.
It's a big step, getting your first real job, and going out into the world ...