Swans were knocked out by Napoli last week.
Williams told WalesOnline: "The Napoli games did affect us because it was such a big effort, but if you asked us if we wanted to do it again, the answer would be 'yes'. I loved it and I think most of the boys did - it's a great experience.
"The only thing is that you don't get to work so much on the next game. Now we've got a good few days before each game to work on the opponents."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball