For speakers and invited participants from Germany we made reservations in Hotel Melody
Israelis and other participants have to find an accommodation on their own. Below you may find a list of helpful links.
Hotels in Tel Aviv via booking.com
Hotels in Tel Aviv via hotels.com
Hotels in Tel Aviv via tripadvisor.com
Hotels in Tel Aviv via www.hotelreservierung.de
Hotels in Ramat Gan via booking.com
Hotels in Ramat Gan via hotels.com
For those who prefer hostels, see e.g. hostelworld.com
You may also search for a flat on homeless.co.il, yad2.co.il (both in Hebrew) or craigslist.