Hospitality Exchange

A great way to travel low-cost, get local insight and meet interesting people are hospitality exchange organisations like,,, Servas, etc.
I start this thread to discuss experiences, hints and reviews of these organisations.
I have used them for many years (mostly as host, because I could never travel as much as I wished), but will let others be first here:
Who has something to say about hospitality exchange as an idea, or the organisations in particular?

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Succeed in your expat family project with advice from other expats