For congress participants:
The meeting site can be easily reached with public transport. It is only 2 stops away from the central station. However, the organizers do not recommend cheaper hotels in the so called ‘Bahnhofsviertel’ surrounding the central station. Of course, hotels like Steigenberger, Intercity Hotel, Hilton Gardens, etc. in this area are ok.
Good price for value is also available in numerous hotels along the Europa-Allee close to the Trade Fair.
You can also check and book your accomodation via the Frankfurt Tourism homepage
‘Frankfurt has the right hotel for every kind of urban explorer. From pure and simple to lavish and luxurious - Frankfurt offers over 50,000 hotel beds in economic hotels, middle class hotels, first class hotels and luxury hotels.’