It depends on the location and the standard of the apartment. The prices you found at Finn are the market prizes today.
By the way, I think a flat at 130-170m2 is not the average size rental apartments in Bergen. Maybe more like 40-60m2. A 130-170m2 rental flat is more an exemption? Maybe it is better to rent a whole house? Minimum 135m2 houses for rent, prices from NOK 12.000,- per month.