http://www.am-tiergarten.de/
or if I am with a girl I stay at the
http://www.lindner.de/en/congress_mo..._nuerburgring/
(on a side note... I travel ALOT... and I mean ALOT! and the Lindner has THE finest selection of in room Porn I have ever ever come across, most of it in full HD! I almost didnt make the track one day

)
for your first time there though, its a no brainer to stay at the Tiergarten. Its restaurant is the PistonKlause which is the 'heart' of the social scene in my opinion.
whats dates you going? I'm always looking for an excuse to go!