With Germany, you should def. con a cultural institute to invite you to give a talk. But if you are going there on a student visa, yes it's whole different story. But to be honest, they are quite open unlike some other people
If you can afford to book a hotel, then just stay at a hotel. They are typically suspicious of friends invitations.
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If you have been there and they can verify that you didn't overstay and your docs are complete, I don't think there is much to worry about.
End of conversation
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