Our objective is to score 15 kills using an MP9. The weapon is characteristic for its low recoil that enables us to fire accurate bursts without having to apply any countermeasures. Nevertheless, the weapon's best utilized at close ranges - if you've encountered an enemy that is far off, fire in short bursts aime at the upper body.
Here are some good vantage points found on Inferno:
This location offers eyes on the door leading out of the building, as well as the main passageway. You can also turn the corner and see if the enemy isn't approaching your location through the secondary route.
A useful elevated vantage point. You can control the door leading to the balcony (the center of the screenshot), as well as move left to cover the main pathway or look right to have eyes on the second route. This location enables you to surveil the whole bombsite, as well as the exit from the second route.
This location offers eyes on the building. You can proceed forward to check the main pathway, or get past the corridor and check the balcony door.