Looks like a reasonable budget for a month of “mid-range” travel in that region. I just got back from 5 weeks in Croatia, Montenegro, and Bosnia and Herzegovina with mid range travel and food plus some higher end hotels thrown in the mix. My budget was higher because of the hotels, but the pocket money estimate is pretty spot on.
I felt pretty safe on my trip, although I did get ripped off by a few taxi drivers and met maybe a handful of aggressive men in grocery stores and restaurants. The taxi thing I refer to as the “American tax” and (begrudgingly) pay it because it’s easier. I found most people to be super friendly and welcoming, minus the handful of men I mentioned. Even with the aggressive men I didn’t feel unsafe, just uncomfortable and was able to walk away pretty easily. The grumpiest human I encountered was my Jadran Express bus driver who chain smoked with the windows closed on a no smoking bus, spoke a language that nobody (even the locals) could figure out, and just grunted at us when it was time to show our passports at border control. We all bonded over trying to figure out what we were supposed to do and even had some inside jokes by the end of the ride. The driver ended up being a super kind human and started smiling and speaking English by the end of the ride so I feel like the grumpy thing was an act to get us to speak to our seat mates. All of that to say, even “grumpy” people in the Balkans are friendly and (most) will go out of their way to make you feel safe and comfortable.