The Hotel Atlantik (Universum) is very near the university (see map below).

The address of the iup/ife institutes is:
Institute of Environmental Physics (iup)
and Remote Sensing (ife)
Dept. of Physics and Electrical Engineering, FB1
P.O. Box 330440
D-28334 Bremen Germany

From Bremen Airport, and also from Bremen Central Train Station, use streetcar line 6 to University, "Naturwissenschaften 1"