Williams went into the action as a second half substitute for Chris Herd and slotted in wonderfully at left-back.
He told Villa's website: "It was good. I really enjoyed it.
"I didn't know what to feel. When the gaffer said my name I was nervous, excited, scared...everything.
"When I got out on the pitch though I felt comfortable. It was a great feeling.
"And it was obviously good to get a positive result. It was a good atmosphere too. The crowd feel right on top of you at Loftus Road. But it was good to hold out for the point."