My girlfriend and I had an overall good experience staying at Amy's Airbnb. Like a lot of others have said, the location of the Airbnb was in a bit of a sketchy area across from government housing. However, the parking lot around back was pretty well-lit at night and I did not feel unsafe or in danger at any point. While I'm not sure how I would feel about my girlfriend was staying there by herself or alone with another female, I don't feel like it would be too big of an issue. The few people we did see walking around were usually just walking to/from the dollar store and not lingering/engaging in shady business.
On the plus side, we did like the fact that the place was very close (within 5-10 minutes, roughly) to most of the places we were interested in seeing in Nashville as well as the airport. The space was very clean, well-decorated, and comfortable. Amy did a great job with communication as well; I messaged her a number of times and received a response within a 1-2 hours, if not minutes.
Overall, I would recommend Amy's place to anyone looking for an affordable, comfortable Airbnb in a convenient location - unless you're a very anxious/paranoid person.