Hey Alex,
Some answers to your questions:
1. Yes, if we enter a recession, housing prices will likely drop. However, if you listen to a lot of the content that BP and other real estate sources put out (not the general media), the ingredients for a housing crash just aren't all there. A lot of this is fueled by the fact that demand is so high, which is likely going to continue for the coming years.
2. Worse case scenario: there's a housing crash after you close and the value of the home drops significantly. You're only "on the hook" if you sell, and the best part is, you don't need to sell because you need a place to live and you'll be living in one side and renting out the other. Even if after two years the price hasn't fully recovered, you can still live there... for Free. You mention that the total PITI would be ~$1,500. I'm not sure what area of East Indianapolis you're in, but looking at the zipcode 46201, the average rent for a 1 bed 1 bath is $1,600. So even if you need to live there for another year, after 3 years that's $52,380 you've saved by not paying your apartment rent, and $3,600 extra you've brought in by renting out the other side (assuming it's a 1 bed 1 bath renting for $1,600 and your mortgage is $1,500 and rent never goes up over those 3 years).
3. If you're able to get the property for 0% down and rent from the other side covers your mortgage, 100% go for that. That's less $$ in the deal, a better ROI and ROE. You can hold $$ for reserves, use what you have to make improvements, or save for another property as well.