Geographically, Zurich is relatively small. The conference location is therefore easily reachable from most hotels. There are hotels in the neighborhood of the conference venue in a 5 to 15 minutes walking distance. Even the hotels in downtown Zurich are less a 30 minutes walk from the University area, where the conference takes place.
A list of hotels, most of them in the neighborhood of the conference venue, is here. Some of them offer a special ETH price. Download the reservation form in PDF (21kB) format, fill it out and submit it via fax or postal mail to the hotel you have selected.