LOVE LOVE LOVE. My husband and I live in Nashville, and we were having an anniversary "staycation" in town. We checked in late-ish (7pm), but Tiffany was cool with short notice. It was amazing to come in to this guest house and feel like we were out of town. So much nicer and comfortable than a hotel could have been.
A few major pluses:
-Smells amazing
-Decor is admirable
-Secret granola bars if you look around enough ;)
-Whole Foods brand soaps and shampoos
-Pretty much any pot, pan, or utensil you might need if you're trying to cook
-THE BED

Some things to keep in mind:
-If you're not from Nashville, you might be weirded out by leaving her immediate neighborhood and seeing the not-so-beautiful Gallatin Pike. However, her neighborhood is very safe, nice, and cute.
-With that in mind, you need to rent a car no matter where you stay in Nashville. You can go from mansions to sketch-ville within one block, and you don't want to be stranded on the wrong street corner waiting for a bus.