I wish you'd gotten more responses, I have a similar question. Did you post anywhere else and get more responses?
I'm still 2 yrs + 11 months away from retirement (who's counting?! ha ha), and I would love to rent out my house for a year and travel from city to city (with my cat) renting a studio apartment from 1 to 3 months (depending on how appealing the city). If I enjoy it, I might do it for a couple years.
A property management company sounds like a good idea, I have a coworker who is building an income stream by buying houses and renting them out, so I plan to ask him how he found his property management person.
I don't know what to do with my stuff tho. No doubt a pile of it would travel with me in my car, but there might be other things I would want to keep but not carry along. I suppose renting the house furnished would solve the 'what to do with the furniture' problem, but there are still the misc items like photos, old diaries, etc.
What did your sister-in-law wind up doing, and is she happy with it?