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May I ask, do they note down the room key times at Magnum (like at Living Room etc.) or is it just a free for all as in the Hessen clubs (now excluding Palace of course)?

Yes Neuenhauseplatz is the stop after Rohrsmühle and the last stop of the 737 bus. Both these stops are within walking distance of the club.

Map can be found here,
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Another option is to take S8 to Dusseldorf-Gerresheim then take the 737 bus to Rohrsmühle from where you can walk to Magnum.

The 737 bus comes from Dusseldorf Hauptbahnhof so you could take it...

Maybe a price increase during Messe?

Dolce Vita are also now charging 65 Euro for entry after 20:00 during Messe.

Thank you Simex for the detailed report, with the late opening on Fridays and Saturdays till 7am I'm now considering a flying visit with no hotel required, did you happen to see anywhere in the club...