A contingent of rooms is reserved at the following locations. They can be booked until End of July 2017 using the keyword "Physikerinnentagung".
Hotel Tanne
http://www.hotel-tanne-thueringen.de/
Jugendherberge Ilmenau
http://www.ilmenau.jugendherberge.de
(Membership of DJH is given by TU Ilmenau by using the keyword "Physikerinnentagung")
City-Pension Morgentau (no vacancy anymore)
http://www.pension-morgentau.de
Further information of accomodation in and near Ilmenau you can also find here: http://www.ilmenau.de/20-1-Unterkunft.html