Two early goals from Gabriel Martinelli and another from Joe Willock gave the Gunners a 3-0 lead at half-time, which Dani Ceballos added to in the second half.
It was Arsenal’s slickest attacking display of the season but there was a measure of disappointment that the side only managed one goal after the 22nd minute.
An element of sloppiness crept into Arsenal’s play and, while Emery was happy with the nature of the victory, he insists they must do better in possession to improve.
‘We played with intensity but then we conceded some possession but we kept the clean sheet. We can improve in how to keep the ball but for the players today, they are very tired after playing on Monday and they still played fantastic, it’s a fantastic victory,’ said Emery.
‘To have six points after the two matches, it’s really important. We can take confidence. We were consistent over the 90 minutes and we can take a lot of positivity from tonight’s game,’ said Emery.
‘The players, when they did all they can like tonight, it is perfect. We did a lot of good, we can analyse to continue to improve. It’s a fantastic victory.’
Emery made a number of changes from the side that drew with Manchester United at Old Trafford on Monday.
Youngsters like Willock and Reiss Nelson paid back Emery’s faith with fine performances and the Spaniard says it’s important they keep getting opportunities.
‘We have to give the chances to the young players and they take them. They are close to playing for us at the highest levels,’ said Emery.
‘They showed tonight that they can perform and they can score. They are playing well, it’s good.’