Lewandowski is probably the right player for the Barcelona team. And he will be able to adapt himself to the Barcelona team very much. But it is not certain whether Lewandowski will join the Barcelona squad. He may even be with Bayern Munich next season. If that happens then Lewandowski is unlikely to be seen in a Barcelona jersey.
We'll see the development of negotiations between Barcelona and Bayern Munich. Indeed there are two possibilities for Lewandowski's situation, he will most likely move if Barcelona are willing to pay the amount of money Bayern want and if not then Lewandowski will finish his contract by requiring him to stay for one more season.
It might be good for Barcelona to wait for Lewandowski to be available on a free transfer at the end of next season, so it will definitely cost Bayern Munich.