The following links may be helpful.
Conference Cambridge - stay in a Cambridge College (Be careful -- a few Colleges are a long walk from the conference venue, especially Girton & Homerton)
University Rooms - stay in a Cambridge College
Benson House - a nearby B&B
Arundel House - a hotel on the river, north of city centre
Cambridge City Hotel - hotel in the city centre
Hotel du Vin - a luxury hotel
You may wish to use something like Google maps to find out how various places are from the main venue, the Centre for Mathematical Sciences.
You might also check booking sites such as
Make sure to select Cambridge, Cambridgeshire, UK (the postcode of the venue is CB3 0WA)
