The Goethe Institut is giving some semi-intensive German evening classes from 30 May-early July and more intensive Summer courses in Rotterdam and Amsterdam. I've taken 3 courses with them already and they are great! The teachers are excellent, put you at ease and they do not apply any sort of learning by hummilation methods you might have encountered at school.
The courses in Rotterdam are cheaper.
The Rotterdam office is within a short walking distance of Central Station.
Courses in Rotterdam are listed here:
There is a registration evening in Rotterdam on May 16th, 16. Protected content . They can see which level is best for you or you can also make an appointment at other times. You can reserve a place on a course before that (well advised as places are limited) by mailing the Goethe at:
Westersingel 9 Rotterdam
Tel: Protected content Fax Protected content
If there are not enough participants for a course, normally 8 people, the course will not run. If you are interested, it's best to sign up for a place at least a week before the closing date.