Williams said: "I thought it was an excellent performance.
"We have gone on from a winning position to take advantage of that, kept a clean sheet and ran out worthy winners."
Real Madrid won the European Cup for the 11th time with a penalty shoot-out win over city rivals Atletico at the San Siro following a 1-1 draw.
Manchester United's teenage striker Marcus Rashford scored on his senior England debut against Australia at the Stadium of Light.
Real Madrid take on neighbours Atletico in the Champions League final on Saturday night.
Real Madrid face neighbours Atletico in the Champions League final on Saturday looking to secure their 11th European crown.
Manchester United sacked Louis van Gaal as manager this week, with the team's style of play under the Dutchman reportedly key to the decision.
Jose Mourinho has been named as Manchester United's new manager - an appointment that unites a man whose handling of