I'm a landlord and I like m2m because if they're not happy, why would I want them to stay? Most of my leases are m2m.
As long as it's priced right and they didn't trash it, I can handle turnover, and I don't generally find that longer leases prevent it anyway. Most tenants don't have enough assets to be worth going after if they default. Just let 'em go.
As far as finding a room, here's a thought: check out AirBnB and see if there's anyone within 20-30% of what you're willing to pay. Send them a booking inquiry and ask if there is potential for longterm leasing at a lower rate.
CraigsList traffic in my area has slowed down lately, and quality is down. They don't show up and they suck when they do. A few weeks into the latest vacancy in my 4BR house, I made a deal with my buddy who lives in the loft that we'd furnish one room and AirBnB it as a trial - which has worked out great so far. We might furnish a 2nd and even a 3rd eventually.
But here's why this might be relevant: I'm not there for higher rent. I'm there for serious, verified prospects with at least some vetting already done for me. I would *gladly* try someone out on an AirBnB booking and then let them stay on afterward at the normal non-vacation price, as long as they don't need the laundry service and mint on the pillow. And this is something you can discuss in advance with the property owner before spending a dollar.
YMMV, but I woudn't be surprised if others out there are just looking for good prospects, and would come off the vacation price quite a bit to have a stable tenant in a long-term lease.