Another protip: If you trade privately via SEPA, and the transfer takes longer than the expected D+1, it is probably fraud or phishing. I reported two such cases to my bank upon reception of the money, before sending any bitcoins of course, and I was right both times.
I don't understand. You received the money, but it was still fraud?
Yes. There are many ways to trick other people into paying, and you probably get a phishing e-mail or two every week yourself. I will not go into all the details here. Just be careful.
I don't trade privately via SEPA, for the reason that I am under the impression that SEPA transfers are reversible and subject to possible chargeback (and for quite a long time after payment was received). Do you know if that is correct?
This is one of the few properties which vary depending on your local regulations and the terms of your bank account. In some countries the bank will reverse the payment and usually close your account. In other countries they can't do that, but will call and ask you if it is OK to reverse the payment. If you decline, the bank may go to the police and claim you must have been involved in the fraud because you received the money. This may get you into a lot of trouble, so be careful.