Nimfa implements trustless system, so you do not need to give your identity to them. All you just need to give is your ETH address and the nimfa you will use for the loan to process the transaction.
If this is so, then how will they make sure that they would get paid on the time agreed on when they do not have personal info about the person getting the loan? Because everyone can promise to pay at the agreed date as much as how they can run away from responsibilities. I mean im not good with these things so im a bit curious. As to how they deal with these happenings.