If you're looking for a place to stay, these hostels / hotels, had vacancies, last time we checked:

Hostels:

Jugendherberge Frankfurt, Deutschherrenufer

http://www.jugendherberge-frankfurt.de/

Double Rooms from 32.50 EUR

 

Frankfurt Hostel, Kaiserstraße

http://www.frankfurt-hostel.com/en/

Double Rooms from 49.00 EUR; Dorms from 22.00 EUR

 

Five Elements, Moselstraße

http://5elementshostel.de/web/index.php?lang_id=2

Dorms from 18.00 EUR; Quads from 22.00 EUR; Double from 52.00 EUR

 

Hotels (Gallus):

Meininger Hotel, Europaallee 64

http://www.meininger-hotels.com/

Dorms from 25.00 EUR; Double from 42.00 EUR (Rate per Person/night)

Breakfast 7.90 EUR

 

Fair Hotel, Speyererstraße

http://www.fairhotelfrankfurt.de

Double Rooms from 48.00 Euro (Rate per room/night)

Breakfast 8.00 EUR

 

Hotels (Westend):

http://www.messeninfo.de/Hotels-Goethe-Universitaet-Frankfurt-Campus-Westend-Frankfurt-am-Main-ZS4031.html

 

Hotel Mondial, Heinestrasse 13

www.hotelmondialfrankfurt.de

Double Rooms from 85.00 EUR (Rate per room/night)

Breakfast included

 

Motel Frankfurt, advena Partner Hotel, Eschersheimer Landstraße 204

www.motel.advenahotels.com

Double Rooms from 77.00 EUR (Rate per room/night)

Breakfast 8.00 EUR

 

Sophien Hotel, Sophienstrasse 36

www.sophienhotelfrankfurt.de

Double Rooms from 56.00 EUR (Rate per room/night)

Breakfast 8.00 EUR

 

Turm Hotel, Eschersheimer Landstraße 20

www.eurobookingdeals.com/de/Frankfurt-am-Hotels/turm_hotel.htm

Double Rooms from 75.00 EUR

 

Fair Hotel Villa Diana, Westendstrasse 83

www.booking.com/hotel/de/villa-diana.html

Single Rooms from 37.00 EUR

 

Hotel Aria, Eckenheimer Landstraße 28

www.hotel-aria.de

Double Rooms from 50.00 EUR (per room/night)

Double Room including breakfast 66.00 EUR