Just wanted to follow up on this thread for future reference and add that the Volkshochschule is another place worth considering for German classes in Berne. I've been doing an intensive B1 course there for the past 4 weeks and overall my experience has been very positive. The classes are an hour and a half a day (plus an hour of homework ... and they really do set enough work to fill at least an hour ... though they are also very easygoing if you don't have time to do the homework some days). They use a fairly good and inexpensive (20 CHF) textbook (Schritte) which you can buy from Stauffacher. We have had 3 teachers for a 5 week course (in succession, not alternating from day to day) which is slightly annoying, but all three have been very nice, encouraging and enthusiastic, and two of them were also quite good on the pedagogical front too, which isn't a bad average.

Having heard about Billyboy's (also positive) experiences with Inlingua, one of their main advantages seems to be the smaller class sizes they offer (he had 4 in his class, I have 11 in mine). They also possibly have more speaking practice built into their system, whereas with the Volkhochschule the amount of speaking has varied from teacher to teacher. One pays considerably more for these advantages though (and you have to pay about 100 CHF extra for the materials).