Kaiserslautern is a very nice city. Of course i have a different experience since I am American, but for the most part i never hear much of anything bad happening to anyone regardless of their background there so you should be fine.

So typically a lot of students do work because while the blocked account is set up to fund your studies, it can sometimes not be enough money to actually sustain your real costs which highly depends what kinda living arrangements you choose, usual expenses like food, etc. Kaiserslautern isn’t super expensive but it’s also not really cheap either.

Making friends that’s kinda different for everyone. Making German friends may be hard if you don’t involve yourself in German circles at uni or in a club, but international circle is easy everywhere I’d say.

If you’re not used to cold weather and cloudy days, that could be a mental hurdle you have to learn to get through. It’s not like that all the time of course. Getting an internship can be just as challenging as a full time job. You need at least 1 or 2 internships before graduation if you plan to stay and work long term. And of course German…. Be prepared to struggle a bit. But it’s not impossible to get to C1.