Overview of hotels in Jülich: http://www.juelich.de/hotelsundpensionen
Bus and train connection from the center of Jülich to Forschungszentrum Jülich: www.avv.de
The next bus stop to ZEL is “Jülich, Forschungszentrum Heizwerk”. It can be reached from the center by bus line SB11, e.g. from bus stop “Jülich, Neues Rathaus”. There is also a train connection, but the Jülich train station is a 10 min walk from the city center and the train station “Jülich Forschungszentrum” is a 20 min walk from ZEL.