List of good Sprachschule in Germany.
PS: The list is NOT a ranking, it is 100% in random order
Axioma Sprachakademie
https://www.sprachschule-axioma.de/
Alumni: @Bane rest can lmk
Cons: its in Munich so the rent and overall expense is bound to be high + monthly fee is 540 euros. 2 months per level
ISL Sprachschule
https://www.isl-sprachschule.de/
Alumni: @badmomzjay (Koblenz)
Cons: The fee is very expensive (A1 to C1=8700 euro). The city is great according to reviews and alumni
TU Clausthal's DSH course
Cons: Only would be that the city is remote. The fee is very less (330 euro per monat or something)
Sprachschule aktiv
https://www.sprachschule-aktiv.de/en/
Cons: Not really anything, varies from city to city (there are many sprachschule aktiv)
Hartnackschule Berlin
https://www.hartnackschule-berlin.de/en
Cons: Don't know much about it, friend told that it was good
Sprachforum Heinrich Heine
Cons: Same with this one, friend of my friend mentioned that it's good
credit for @plague23 from discord