Check these options:

   Guesthouse: This building is in Goztepe Campus, but it is not allowed to stay

• more than 14 days. The price per night is between 50 TL and 60 TL. Rooms are
  for maximum 3 people.

 

•  You can stay in this hostel in Kadıköy. Check this link out:
  http://www.hushhostelistanbul.com/

 

• Also you can stay in this hostel in Taksim. Check this link out:
  http://www.hostelneverland.com/main.htm

 

• Also you can stay in this hostel in Taksim. Check this link out:
  http://www.hostelsclub.com/hostel-tr-15501.html

 

• Youcan always search some available room or apart via;
  http://www.sahibinden.com/en/
  http://www.hurriyetemlak.com

 

• Or you can contact with Marmara Student Group Network via;
  http://www.facebook.com/home.php?sk=group_193598380675382&ap=1

 

•  Of course it is always possible to find a possibility by facebook, twitter and wachsurfing.
  com
  In the meantime, we recommend you to search about accommodations

List of Hotels

List of Hotels