Ah John's.....this is a good ol' classic car diner. Much of the inside is original - booths, counter, stools, hat racks, etc. Food is good, standard diner fare. Nothing outstanding but still solid. My friend says their pancakes are the best she's ever had. I've never had them as I'm not much of a pancake eater, but she's a connoisseur so I'll take her word for it. As for cleanliness - I've definitely eaten in cleaner joints. I've never been in the bathroom, not even sure if they have one. Also, I wouldn't look at the floor if I were you...
The reason John's gets 4 and not 3, is they have what I call a great 'diner waitress'. A great diner waitress is somebody who is very efficient, never misses anything, and always keeps your coffee hot. She calls you 'hun' or 'sweetie' but it somehow isn't patronizing like it is when other people say it. Don't know her name and she's very young but she is great and is always there.
John's is a classic type place - looks rough on the outside, not too far behind on the inside, but will serve you up a good, hot meal quickly and cheaply. Oh, yeah - CASH ONLY.