Im not digging for an IRS cite, but ANY website you read, explains that if your average guest stay is 7 days or less, it goes on Sch C, regardless of substantial services, its only when the average stay is 30 days or less then the substantial services comes into play.  Sch C takes care of your non-passive situation.

https://financialsolutionadvisors.com/blog/do-rental-property-owners-file-schedule-c-or-schedule-e/