Extended stays with guided tours also available. Seniors Abroad International Homestays. Three-quarter homestays of 5 to 6 days are arranged for active persons over 50 between U.S. and New Zealand, Australia, Japan, and U.K. Servas. Families and individuals are welcome. The World for Free.
Membership is very cheap and there are lots of member groups to choose from.
Must be a U.S. resident. The owner provides contacts and help in getting around. Free message board and mailing list.