Which wallet do you use for storing your ERC-20 token?
I personally like MEW because it's very easy to use. Some people like Trezor or Ledger but personally I have no problems by using MEW

In MEW you have complete access to your private keys.
Coinsbank easy to use and understand what you're doing. The transactions feel safe enough. For an exchange to trade into fiat currencies, I would recommend it.