Going back about 30 years ago, a group of young witnesses from my congregation went to London. They were staying at a hotel for a few days. I and one of my friends wished we had gone too but couldn't afford to stay in the hotel.
A friend of ours who had gone to London arranged for us to stay at a sister's who they had met in the museum. We never got to meet this sister but she left us her keys at the museum with instructions to get to her flat. She didn't know us but trusted us because we were sisters.
Quite amazing really.