The following facts:
my neighbor wanted to buy a new laptop via Willhaben. I recommended a Macbook to him about Willhaben. The neighbor gave me the 1400 euro and I bought the perfect laptop anonymously from a private buyer and brought it to the neighbor. After a month he says: he wants to give it back because he wants a new one and threatens me with legal consequences!
Should I be worried?
No, you don't have to. He simply has no legal options.
However, I would consider whether I would do this person a favor again.
You're right
Is there ever a contract? And i don't know the buyer