Came here on NCAA Basketball National Championship game night since many of the Town Square bars were packed.
Double Helix is a very nice casual space to grab a beverage and relax. The interior is very classy and has dim lighting. Although they weren't all that busy, they still had plenty of TV's showing the game which was an added plus!
The food menu is rather limited since it's primarily a place for drinks. A few of my friends split a bottle of white wine since it was a 50% off Monday special.
Our waitress was very friendly although we felt she disappeared quite a bit for a not-so-busy night. Someone in our group asked her for a wine from the state of Washington and she didn't really have an answer and began flipping through the menu.
So overall it was a good expereience, expect a bit of mark-up for the atmosphere but I would not be opposed to coming back here again!