I don't think you can legally do that if you can't legally host in AirBnB. You may, but e.g. my lease (before I owned my apartment) specifically limited non-family[0] stays to no more than 1 week at a time, and no more than 4 weeks per year total. On one hand, it is non-trivially onerous. On the other hand, I really liked the apartment, and I understood the rationale.

[0] the "family" was very broadly defined - e.g it explicitly included unmarried S/O and their family, and implicitly close friends. but it wouldn't have included "someone I never met and who found me on couchsurfing.org".

I had seen a site that does this[1] but think they are more geared to bigger residences.

May have small setups too..

[1] http://lovehomeswap.com

http://www.horizonapp.co may be able to help :)

some group unlock codes: couchsurfing airbnbhosts