My wife stayed, here is her review:
Robyn's place was very clean and tasteful. The loft itself was great. It was located in a nice neighborhood near some local Nashville treasures including some great restaurants. I was alone and it was perfect size wise for one, and would work for a couple as well.
While there is no shower, there were essential oils, bubble bath and candles near the bathtub which was a very nice touch.
Be aware that the stairs are very steep to get to the room.
This room is located, as described, on the top floor of a house. While it is indeed separate, this brought about my one issue with my stay. I found that the noise level from the other living space was significant. The folks downstairs were going about their lives and between kids being kids and what sounded like a small party one evening, it was often not a peaceful place to stay.
While I got by fine, being gone most of the day and up early anyway, if you're in town to enjoy the night life and want to sleep in this could be problematic. Along the same lines, since I could hear every noise they made, I felt like I needed to keep quiet at night to avoid waking them so a late night return from a music venue or bar could feel awkward.
All in all I'm glad I stayed here as it was a good value and worked for my trip, but I think folks going in should have this info and it would personally stop me from staying again.