@Jenny Scott What you are suggesting would not be my preferred direction from experience. No two people clean or consider clean the same way. Years ago my daughters and their families shared a tent camper. It always starts off well. Then, somebody breaks something and does not repair the damage or doesn't repair it soon enough for the next usage. One party wants out because another party did not clean the unit to their satisfaction after use. In short, relationships get harmed.
Check the regulations and laws in the area before making any decisions. You might be better off listing it with a management company and book your stays when you want them. If you don't intend to stay there more than 10% of the time, you can depreciate it as a long-term rental of 30 days or more, or short-term rental <30 days or transient (like a hotel) for 7 days or less.
I just published a Q &A document about STRs because we have been seeing the majority of depreciation schedules for STR are not being done correctly and there is too much misinformation on the Internet.