I spent 3 days in a city that I’ve already been to. It only confirmed how green the city is and how livable it is. I would have no issue spending a few years here.
Just a tip: Do not stay at the Jugendherberge. It’s a waste of money and provides no atmosphere. Unless you’re going to see the football club, this is the worst location I’ve been in. If you are going on walks or short hikes, that’s about all they have in the area.
Freiburg honestly isn’t a city for tourists. They have an old town and some shopping, but I think this is just a good place to live. If anything, use Freiburg as a gateway to France, or to any hiking you would want to do in the area. So, instead of showing you Freiburg again, here is some graffiti: