Seraphim is located in a small house in Donelson. It's cozy and friendly. They use Aveda products exclusively, so the place smells great. For an unassuming location, Seraphim offers very high-end services. You can get a hot stone treatment, several varieties of massage, and what I think is the best hair coloring in town. Very subtle, professional work.
Seraphim also sells a full line of Aveda products.