Homeexchange.com is a popular home-swapping site, where you only pay a yearly fee of around 200€. You can do a simultanously swap, or earn points by letting others use your home when you’re away. You can then use those points to stay anywhere in the world.

Do note that Homeexchange has dual headquarters, both in the US and in France, but has a huge membership base in Europe

As opposed to AirBnB, Homeexchange is more:

• cost-effective, you only pay the membership-fee
• sustainable (it’s not speculative like people buying property just for renting out)
• better traveling experience, when living in residential areas instead of a touristy place.
• It offers you a sense of community, respect and connections across borders.