Arnautovic scored both goals for Inter in their 2-1 defeat of Vaduz in a friendly on Saturday.
“I am happy,” he admitted to Sportmediaset after the game.
“It went so much better compared to the two previous games during which I had not played well.
“I have worked hard since last summer and today I have reaped the fruits of my work.
“But if things went smoother, the whole team deserves credit. I am delighted. It was a friendly match, but it was nonetheless tough and we were very determined.”