Home exchanging is a novel idea as long as both parties are honest and both benefit. This is similar to time-shares here in the U.S. where owners can share properties with one another. You do need to make sure you are legally covered during your stay. You may want to look into getting some insurance that will cover you and the property you are staying in. You might not be covered under the home owner's policy. Some of these agreements count as a rental and are not covered. Also, you could get expatriate health insurance to make sure you are covered on that end as well if you are planning on staying longer than a vacation