The meeting will take place in the seminar room 1 at DESY in Hamburg. To reach DESY, please have a look at http://www.desy.de/about_desy/getting_there/hamburg/index_eng.html.
Seminar room 1 ist located in building 1 as shown on this map:
If you need accomodation you might check the DESY hostel:
The Mercure hotel is located close to DESY: