The first step is to try not to get emotionally involved (I know, easier said than done).

Digging a little deeper it looks like the rents have been poor at best for the past few years and the cash flow is an over estimate.

It sounds like you may be emotionally invested and you might be trying to convince yourself that its a good deal seeing your "potential profits".

Dont use your emotion when screening tenants and dont trust anyone.

After an application is received (which is after more rounds of pre-screening) I'd look into something like a deeper check into credit and address history as mentioned above @Carrie Albertson.

Does the copy draw emotional involvement?  

With that said, while moving out might have been the best thing you could have done for your own emotional health, that doesn't mean your LL has to "eat" your moving out with little or no notice. 

@Joseph Cornwell Thank you for your inputs,I agree with your analysis.My investment strategy is value add apartment building (15~20 units) in neighborhood B/C,I know east side high levelly better than west side,but I am open to west side as well as long as I can find good deals and team.So right now I just deeper my understanding of the west side of Cincinnati market,hope I can identify decent area and deals/teams to match my target.

Sorry, but I am just being realistic....impression and emotion is everything. 

You defiantly do not have to diddle with real estate.If you want to retire get out of real estate not deeper into it.