I train with Steve Kardian whenever I'm in the Westchester area. There are 2 black belts that train there (I forget the other guy's name) as well as multiple others of other ranks. Steve teaches, and the other black belt randomly rolls around on the mat, pulling people out of the instruction to roll playfully with them; it's hilarious. He'll literally just roll towards you on his back, start pulling you into some position,and you're rolling with him. Sounds odd, but it was truly relaxed and fun.
Very chill atmosphere, good instruction, good rolls with all of Steve's guys, and Steve himself has been extremely kind and welcoming to me each time I've visited. Highly recommended!