Hi there! Last summer, I was in the same situation: where to learn German, which language school to choose, prices and so on. I was feeling a bit lost in this "jungle". I finally came across cactus language website in which you can find different schools (accredited) across Germany. This helped me feel more relaxed when choosing my school, I was quite afraid of paying hundred of pounds for a bad language school. My final choice was made in favor of the cheapest school in Berlin and I was almost fully satisfied with everything. You can take a look at Cactus Language, it'll help you take a decision. Cheers!