Best Seoul Jimjilbang for First Time Visitors?

My American friend and her boyfriend will be visiting Seoul for the first time and would like to visit a jimjilbang. The first two days of their visit is March 20-21 during the BTS concert. She had no idea who they were and how huge the event would be until I explained it to her. I suggested a few things she could do other than Bantan-related events. I'd like to point them to a foreigner friendly jimjilbang (not like the traditional bath houses of my youth) in Seoul proper. Any suggestions?