My SF friends have taken me a here a few times for a nice slice of old San Fran. It’s a diner which has all sorts of diner appeal (I recall original brown/orange tile work). Louis’ overlooks the old Sutro Baths. The food is quality American fare, the atmosphere is casual in the best sense of the word and the view is sweet. Go here — but don’t tell too many people as it really is that special.