My thoughts are that this is usually a scammer operation.
They say they only accept bank transfer you make the booking , they give directions and just as you turn up they ask for the payment or at least a deposit before giving you the final details (which will never come).
I had one on Vivastreet in Chelmsford, who insisted on cash. I said I was nearby and no problem I'll transfer the deposit.
Just so that I know you're genuine, I'm in your street, can you tell me what colour is the BMW parked on the road opposite your building.
I made that up, but you can guess the outcome.