Podolski was first to arrive after completing his move ahead of Euro 2012 and Mertesacker says his Germany team-mate has enjoyed a seamless transition to life in north London.
"I try to do my very best [to help him settle]," the defender told arsenal.com. "I had the same thing last year and it is good to have a lot of help in your first moments in a new city with a new language. It is good to have some German friends around you.
"But the Club is doing well also. You have a lot of people who have been very helpful from the beginning. Everything is going fine for him and I am very happy that he is here to give his best for Arsenal.