One of simplest of exchanges I've used is
UniEx. Though it requires you to create an account with just your email, you don't need to do any KYC or ID verification. Just select the currencies you want to send and receive, put in the amount, send the amount and as it gets 1 confirmation, your exchange would be complete.
And I haven't seen any scam accusation against them till now. Correct me if I'm wrong.
But unfortunately, it won't let you send BTC for ETH now. But if you don't mind waiting, stay tuned and check the site sometimes.