Originally Posted by
der_saeufer
OP, it sounds like you trust the B&B owner, so if you don't want to deal with a stack of 20s I'm sure she'd be happy for you to send payment with a bank transfer, which you can do easily with Transferwise.
Having thought about it some more, the trouble with a bank transfer is the mess we might find ourselves in if we had to cancel the trip after we'd initiated the transfer and I had to rely on her to transfer the money back to me. The last time we stayed at one of her properties, she was happy to come back a day or two after we'd arrived to collect payment, so maybe she'd be OK with a bank transfer after we arrived?
I'm beginning to think a stack of 20s is the simplest solution.