Berlin is a big and very diverse city. It can be that you don't like one area and love another one. So I recommend to travel around Berlin and check if and where you like the atmosphere. If you are quite poor for German standards, you will most likely have to move in one of the shithole areas where life is very tough and not much fun. If you make at least 1,5k€/month, you will be able to live an easy and comfortable, but not in any way luxurios, life.