Do you have any friends who have lived in Aachen, Germany? Please tell me about this city

I have lived there for about 2 years but I don’t know where to start. You can check the official introduction on the website. I will give a little description of my impressions

Let’s talk about the weather first. It's not too cold. It only snowed a few times in the two years I lived there. The transportation is only buses, cars and taxis. What I'm talking about is that there must be trains within the city that lead to other cities, that is, there are no subways or light rails. Generally speaking, in Germany, it is average. Very few people who travel to Germany go to Aachen. There are no particularly famous attractions. The city center is not prosperous, but the city is still pretty.

I don’t know anything else. If you know how to say it, just ask me when you have time