The 25-year old Germany international joined the Gunners from Real Madrid for a club record £42.5million in late August and admits he has settled well in north London.
"I feel comfortable here. You can see on the pitch when we play together that we have a very good understanding," he told the club's official website.
"The team is great and for me it's been very easy to settle - the German players here have helped me to establish myself quicker than I perhaps would have done were they not here.
"But ultimately I feel pleased. The people are very friendly and welcoming."
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