In reply to nt6294:
I don't live there anymore unfortunately. But head down to Salon du bloc on Eppendorfer weg (christuskirche closest metro station) and you will find a great gang of really friendly climbers. Once you make a few friends, go and check out the Killimanshanzo in Sternshanze. No 'elf and safety here!
I'm hugely envious, Hamburg is a wonderful city. Have a great time there
Slim