Commonwealth is always on my list during a downtown bar crawl.
The interior is amazing with plenty of places to sit and hang out with friends. I'm a huge fan of the open floor plan. The roof provides a pretty good view of downtown and has a pseudo-dance floor set up. The bartenders have always been really friendly. If you're a fan of gin & tonics, I recommend the London Commons cocktail.
Worth checking out if with the right group of friends!