@Dave1124 In my experience, the gains weren't worth the loss. I have a 3 story log home in the mountains. I live on the garden level. No "shared" space. I travel with my work, and can sometimes be gone several months at a time. I left my apartment to work in Austria for 4 months, 2 years ago. I paid someone to live in my apartment, and "co-host". My ratings plummeted because the grad student made noise (was the primary complaint), and did not respond to the guests request for assistance in a timely manner. I even had a couple guests complain that the host could be seen in the mornings outside doing yoga and they felt uncomfortable sitting on a full wrap around deck. At least in our situation, most guests make reservations thinking they have the place to themselves. They don't want to hear other people on the property, or a floor away, and the reviews going down to just 4 can really hurt. I just take the hit financially and don't rent out my place when I travel. My experience is guests on vacation don't get excited about "sharing", even when the properties/units are completely separate.
