However, England came under immense pressure from the Italians in the second half and Rowntree admits that he was delighted once the game was over.
"Massive is an understatement," Rowntree told Sky Sports News.
"We've come through a massive scare there and credit must go to the lads for coming through that.
"The word 'lottery' is used often when it comes to scrums and it swung both ways today."
England travel to Cardiff to face Wales in the title showdown next weekend.