And Arteta thinks his side should be taking a bigger lead back to London.
"It's a really good result. First of all to win away in Europe but to come to a ground like this and win, credit to the lads," he told BT Sport.
"We suffered for the first 10 minutes, we gave the ball away too much and couldn't get any continuity in our play. In the second half, apart from the set pieces, we controlled the game much better.
"We could have put the tie in a better position. We had positions and chances where we'd expect the players to put the ball in the net.
"We're going game-by-game. There are a lot of things we want to improve. I still see things that mean we can't control the game and damage the opponent. But we are playing with a lot of commitment. We had three players with cramp, struggling at the end."