NYE recommendations

Hey guys, pls, give me and my wife some tips for best fireworks spots in Oslo. I was thinking about going nearby the Opera House since it is the most significant landmark I guess there will be some people celebrating. We wanna have predrinks at home and 30 mins before midnight move to center. After midnight it would be nice to grab a drink in some bar. Is there any street in centre good for this? Btw we staying in hipster area near Mathallen.