@Yu Jin Song
I do not specifically know the market but I use Vestmap's zipfinder to look for areas I would invest in nationwide. See the map below for what zip codes I would initially be interested in. Then I run reports on exact locations, these can be for any location, on or off market. I would for sure checkout the zip codes 45439 and 45409 based on my preliminary look if you want to be in the heart of the city but don't discount the suburbs especially if you are looking to invest in SFH.
As others have mentioned a house/apartment built in 1900, 1950, and after 1980 are very different in terms of capital expenses required. If I go into any market I'm ideally buying 1980 or newer. If I'm buying old then that it becomes very important to understand capital expenses for upgrading plumbing, electrical, fixing foundations, etc and understanding the properties current condition.
I love out of state investing, just be careful with the location and the asset you buy!