Firstly my opinion is not neutral as I work at academia
What I can say is we have extremely happy German students here. We offer intensive courses and a creche/childcare every morning so you can bring your kids with you.
We are an established teacher training and TELC exam centre. So we offer German exams from a very low level onwards - many people really appreciate this as in having something to work towards and show for their time here.
Our teachers not only know their subject matter but are trained in communicative language teaching - meaning you will actually use the language for real life purposes rather than just learn about the grammar!
We have a regular Stammtisch - social pub outing and a diversity of nationalities in the German classes.
Most importantly we are a friendly group here with an informal, open atmosphere.
We are not the cheapest - but in terms of quality I would say we are the best