"Old Beijing" accented Mandarin
The "Old Beijing" (老北京） guy's Mandarin can be really strong and hard to understand, though i do enjoy listening to the accent.
Had one old dude offer to take me on a tour of the hutong, which i was semi-interested in, but had to decline since i could hardly understand what he was saying!
He probably mixed in some Beijing dialect words with the Mandarin that he was speaking.
The women tend to be easier to understand as their local accent isnt so strong.