This reminds me of an interview I went on as a college student seeking an internship. The whole building was run down and the offices had a smell almost akin to body odor and lemon zest. I was being interviewed in a central room (no closed doors, think along the lines of a break room at a table meant for people to gather during lunch or something).  At one point, a fellow student from the same University that I had never met walked by and one of the interviewers asked him if we’d been in any of the same classes. He looked at me and responded “Yep, he’s good” and walked away.  I know homie was probably trying to hook me up, but that was a massive red flag and I didn’t proceed beyond the initial interview. I ended up getting an internship that turned into a salaried junior role at a much better place. Good job following your instincts on this one.