Be forewarned that the Benedum is HUGE, although if you're used to standard tour houses it'll be nothing new to you. It's a lovely space IMO, despite the barn status.
I've sat pretty much everywhere and there really isn't a baaaad seat in the house, just some that you will have to strain your eyes to see haha. The legroom can be tight though and if you're a taller person you may want to go for the front of a section.
The stage door is right around the block on Liberty Avenue.
Keeping BroadwayWorld Illustrated