We did this when the kds were little for about 12 years on the trot in pre-internet days, which involved lots of letter-writing & expensive calls. It’s much easier nOW.
It’s great, cheap, and you get much more accommodation than in a holiday let. We swapped with families in the UK for single weeks or weekends, and for fortnights in Sweden (3x), Germany (several), France & Canada (2x each). Highly recommended!
Postie – are you taking your statins now?? I hope so.