The teenager was integral in City’s second goal and was lively and inventive throughout his 56 minutes at the Emirates.
"He played so good, as we knew he would, and as he normally does,” said Pep.
“It was his first away start in an important Premier League game and made every action, both offensive and defensive, brilliantly
“He played in a position he was not used to, but playing away at a big club, he did every action with a good rhythm.
"Tactically, we counter attacked well. We can press better, but Kevin, Raheem and Phil have pace on the break and it worked well.”
The Catalan said his team’s ruthlessness in front of goal was the main difference overall, with the Gunners denied by Ederson in the first few seconds.
“They had the first chance and missed, while we Kevin scored an incredible goal with our first chance,” he said.
“Arsenal away is always difficult. It is not an easy place to come.
“We tried to press high and do more passes, but it’s okay as away from home, it is difficult.
“Sometimes we make mistakes and in the second half, we struggled first 20 minutes to find space.
“But the reactions are always there whenever we have lost a game this season, and also the previous season if we had a set-back.
“We lose some games this season and last season only a few, we sometimes play much better than today and we lost, but football is like that.
“Against United we were better. We had an incredible result today but I think the way we played against United was better in many, many ways.
“I know we are judged on the result but I have a duty to judge the performance, not just the result
“We started 17 points behind Liverpool today and had to play Arsenal away, so big congratulations to the team.”