I'm from that area. Middletown has the best* heroin in all of southeast Ohio.
Seriously, it's going to be a big social / weather shock moving from CA to that area of Ohio. There still are some nice areas to live outside of Dayton, but the actually city of Dayton is a little rough (just like about any larger city anymore regardless of the state). I actually sold my grandmother's house in Carlisle, OH around a year ago, and they are building quite a bit of new housing and businesses, so it's slowly replacing some of the old run-down houses and businesses that have been closed for at least a decade now. My brother lives in in Dayton, so when I go up there we take the kids to the Dayton Mall and to the Wright Patterson Air Force museum (which has an array of full-size displays of ICBM nuclear missiles since they created), and it is mind-blowing to see their size in person.
I still like going back every few years to see some old friends, and eat some food I can't get in the south (Gold Star Chili, Skyline Chili, Donatos pizza, UDF (United Dairy Farmers) milkshakes, Superman ice cream), and reload on some Ohio State gear. Over the last 6 years or so, I was going back there 2-3 times a year for deaths in the family / handling estates, etc.
*Heroin use is truly bad in that area. There were several people from my school that died from overdoses (including a girl I casually dated way back in the day).