@Edi C.
Actually, what I have is two completely separate houses across the street from each other. Each one has it's own listing. Then, I created a separate listing where guests can rent both homes together for one price. This listing gets booked less frequently, but when it does, I make more money than renting each house separately because I price that listing a little higher than the two separate homes combined. If you search my area for a listing to accommodate 14 guests, only three listings are available in my area - and mine is one of them is mine. There is no physical change to the space. Large families have booked it, wedding parties have booked it (bridesmaids in one house, groomsmen in the other), and currently a group of workers are staying in it.
I got this idea listening to a Podcast where a host in the Dominican Republic owns condo buildings - he lists each one bedroom condo separately, but he also lists the whole floor as a unit. I don't think he makes physical change to the space either, but larger groups can book, and each have their private spaces. He charges a premium for the whole floor, and has less competition offering listings to accommodate a large group. He actually keeps the larger calendar open for a year, while he only opens his smaller listings open 6 months in advance - allowing him to hopefully book more of ther larger more expensive listing. If I had a duplex (or created one) I would do this same thing. It allows you to market in both arenas - the smaller more popular listings with more competition, and the larger listings with less.
My apologies if this was confusing. Best of luck whichever you chose!
