Long story short, I would highly recommend Urban Nashville, as well as Mercury's place. The located in the Gulch was perfect for being away from the Broadway nightlife, but also having places to go right outside your door. Access to a small convenience store and liquor store, and perfect pick up spot for Uber and Lyft.
The unit was amazing. It was spacious, clean, bright and very comfortable. We traveled with 4 adults (all women) so having the full bath as well as the half worked out great. The privacy might be tough for couples, but it worked out fine for us.