To be student at ESSReS
PhD's at ESSReS are part of the PhD student community at Alfred Wegener Institute, the University of Bremen or the Jacobs University, depending of the project where they are applying for. Hence, the host institution provides for support in all kinds of questions regarding formalities to be done with the administration, the registration in Germany, the installation of day-by-day live, etc.
Some general informations can be found here:
AWI PhD student pages
University of Bremen, Campus life
Jacobs University, Campus life