The 20-year-old scored the winning goal in both the home and the away legs of City's quarter-final with Dortmund.
"You have the feeling he is a guy who never hides," said Guardiola after the game.
"He always creates something. He is dynamic offensively, defensively and in the small spaces.
"He is learning to make decisions. He scored two important goals to help us be in the semi finals.
"In the quarter final of the UCL he was the important player to help us go to play PSG."