The location of the apartment is right in the city centre, one street down from Johanneskirken. Torgallmenningen, Fisketorget, Bryggen and every place you'd want to visit are in walking distance (3,5 and 10 minutes on foot).
Of course I expect you to treat the apartment with care.
It should be quiet by 11 pm. (of course tv and regular indoor voices are allowed, just not loud partying :)