[QUOTE=Ortos]I am responding to your question from the Oase thread here, because it fits better:
You don't have to be Einstein to bring GT to the top of your list of clubs to try based on the criteria you list. Not too far from an airport (D-dorf), very clean and best of all: Possibly the best day to day line-up in FKKland. Problem: If you go there you may never leave! It is not the easiest to get to via public transport, so you really should do it with a car. If you do get a car, you are not too far from PHG/VV and/or LR. These clubs can be more hit or miss than GT in terms of line up however, and VV has its own problems in other respects (see that thread for more info.).
One club getting good buzz these days is Samya in Koln, and it is public transportation friendly.
World is, as we said, a top contender, but it is not so easy to get to. Maybe leave that one for another time...
Ortos[/QUOTE]
Agree with Ortos. Based on your criteria GT fits the bill, although it is 35-40 minutes driving time to DUS airport and isn't really doable if you're on a tight schedule via public transportation. LR is much closer to DUS (about 15 minutes) but isn't as large and can't compete with GT's varied lineup.
As Ortos also said another option is Samya which is about a 10 minute drive to Bonn- Cologne airport, is accessible via public transportation, is a clean well-run venue and has decent varied lineup, although certainly not on GT's level.