Hey @Patrick Gilbert,
I'm not in the Indianapolis market (Winston-Salem, NC. Two major hospitals, 5 universities, and the normal random house relocation/renovation/etc keep us booked) but we started focusing on mid-terms about 18 months ago and its been successful for us. Lot's of great advice here already, I'll just add what we've learned as concisely as possible.
And just for context our niche within the MTR space is to be in the top 5% of listings in our area. We aren't appealing to the budget travelers who rent by the room/look for the cheapest option/etc. (Not to say that isn't a viable strategy! Keypadding doors/renting by the room can be a better cashflow option. We just like the tenants better in the top 5% space)
1. Looks matter. Stage well, get professional photography. Hire out what you can't excel at yourself. (We stage but hire out photography). Similarly don't necessarily copy STR or hotel style staging. People want to feel like this is home since they are staying for 30+ days, not a vacation. Nice, comfortable, and functional.
2. Speed matters as @Kenny Hall said. We've had our units flood, Heating go out when it's below freezing, AC go out when it's above 90, keypads die and locking tenants out, etc. Speed to address a problem matters way more than the problem itself. Even with all those problems (some of which were pretty bad!) we still haven't gotten below a 5 star review. This also is true of finding new tenants. The faster you can respond to new inquiries the more trust they have in you and your listing. It sets the tone for what it will be like renting from you.
3. A dedicated office (or at least a desk in a good location) and high speed wifi help you stand out.
4. There are weird quirks of MTRs. Did you know freezers need to be opened regularly? Did you know most refrigerators will freeze over and shut down if it's not? Did you know sometimes nurses who work night shifts only eat out and don't use the kitchen for 9 weeks? You see where I'm going with that. We started including ice-cream sandwiches as one of our amenities just to incentivize tenants to open the freezer regularly. $15 is cheaper than a $75 technician.
5. Amenities are different between STR and MTR. Think home, not vacation. AKA things like a nice Coffee pot instead of a Keurig.
6. 1 bed or 2 bed units are your sweet spot. You can do bigger (our biggest is a 4/2) but it's easiest to fill and charge higher rates per sqft with 1 or 2 bed.
7. We use Airbnb, furnished finder, and facebook groups. "Travel Nurse Housing - The Gypsy Nurse" is the best facebook group. We get 20-30% of our tenants from there. You need to apply. It's worth it. 50% of our business comes in passively through Airbnb/Furnished Finder. 20-30% traveling nurses we actively source from FB groups. 20-30% referrals (if you have a nice place people talk about it).
Happy to chat if you have any questions!