It is important to try to get along with your neighbors. If it is after hours and they are being excessively noisy, call the police as this is a violation of disturbing the peace. If they are just routinely noisy and it is not extreme you can contact them directly (and nicely) to let them know that the noise level of their apartment is at a disturbing level. They may not even realize that they are being loud. Or, you can contact Management during normal business hours to relay this noise issue.