We really enjoyed our stay at Devon's mansion. It's a cool place with a lot of history, and there's plenty of space for a big group to have fun. We thought it could be located a little far from downtown, but it's really close if you just take a Lyft, less than a 10$ ride.
The mansion is of course rally old, so if that bothers you, maybe choose a different place. We were a group of 14 friends in our early twenties, and it was a perfect place for us to stay while visiting Nashville. The jukebox was a big hit, it has a lot of cool songs! It's probobly not the place for families with kids, but it was amazing for us.