I stayed at the Urban Nashville guesthouse while attending a friend's Nashville wedding, sharing the place with a couple (who slept in the upstairs bedroom) and I took the pull out sofa. Sleeping accommodations were comfortable, although the downstairs is a bit bright for those of us who sleep late :) The downstairs area has a garage door with a bunch of windows that opens up to the outside patio, which was a nice touch. It looks like there was also a fire pit, which we didn't get a chance to use because of the short duration of our stay.
The location is perfect, right next to all the restaurants and shops on 12S, easy to get to all other sites in Nashville.