Com Berlin Languages

I have been already in some German schools around Berlin and I was ok with the most of them but I have to say that this was the worst school I have been to.
We had no book, no program, we never knew what to expect in terms of content and there was a big difference between the level of the students in the same room.
Every week there were new students, so sometimes we had to repeat the same topics over and over.
I had 4 different teachers in 5 weeks and although some of them tried to attend the request of the students, there were also lazy teachers and one of them I have to say she was really arrogant and like mocking mistakes of students.
The place is an apartment, so it does not have the structure of a school, in some rooms the disposition of the tables are really uncomfortable.
To go there is waste of time.