The university is very close to the train station and Bern is small. The conference venue can be easily reached from any city hotel using public transportation or even on foot. Here you can find a non-exhaustive list of hotel recommendations.
Hotel Kreuz
Set in the medieval Old Town, this 3-star Hotel enjoys a central location in Bern, a 5-minute walk from Bern Train Station. It features modern accommodation, the Bärenhöfli restaurant and lounge bar, as well as free fitness facilities. Availability and prices see: www.kreuzbern.ch
Hotel ibis Styles Bern City
The ibis Styles Bern City is a 15-minute walk from Bern Train Station and a 20-minute walk from the Old Town. By public transport, the train station can be reached in 5-10 minutes. This newly built 3-start hotel has a small bar, and the rooms feature air conditioning, a flat-screen TV, a safe and a bathroom. Availability and prices see: https://all.accor.com/hotel/9662/index.en.shtml
Moderately priced, Hostel 77 is situated at the foot of Bern’s local hill, the Gurten, and is seven minutes by bus from the main station. All rooms have a sink and are accessible for guests with disabilities. Shared bathroom and shower facilities can be found on the same floor. Free wifi. Availability and prices see: www.hostel77.ch