If you are renting an apartment, the first question has to be, "Which type of cable supplies the house?" (Co-axial, fiber optic, or simple copper wires)
The owner of the house decides which cable supplier to use and you have to go along with that. Or you might be forced to use Swisscom / Sunrise and receive TV / Internet over the telephone cable. (Not the best choice imo)
be present, or UPC-Cablecom, (or you might be stuck with ADSL, but most unlikely in Bern town).
I don't know much about Quickline: I believe they own the fiber optic cable networks and sometimes other companies use their cables.
UPC-Cablecom has a wide network of co-axial cable and you can check if UPC-Cablecom is available at any address, by using this tool, http://www.upc-cablecom.ch/en/tools/availability-check/