I also spent time in Corryville (near UC) and Avondale, both while I worked at the zoo. I liked Corryville as well because it was easy to walk to quite a few places. I lived in a first floor apartment, was out at night alone all the time, and never had any issues. For Avondale, I'll just say somehow I never got shot
I would recommend Oakely and Hyde Park. I also looked at a few places in Mt. Lookout, and have been to quite a few nice place across the river in Covington and Bellevue. I'd stay away from O'Bryonville, as I heard only total douchetards live there. The key I found was staying out of the big apartment buildings. Outside of one place, all my apartments were in houses or 4-ish unit buildings. My apartment in Oakley was right above a wine store. It just took a whole lot of leg work, and a little luck. I'm spacing out on the agency I rented thrugh at the moment, but I'll dig out my old check register when I get the chance.