We use to go there. We stopped for two reasons, the first being the owners smoke and always sit out where we sat and secondly, they were very rude to us on several occasions. Which was weird as the other riders had been going there for a few years regularly.
+1 for Cudlee Creek Cafe. The staff are friendly & well used to visiting cyclists. I regularly stop there tues & thurs with a group. One of the staff, Megan, makes a point of trying to learn all our names. Not much of a coffee connoisseur to comment on coffee quality.
North Adelaide Scuzzi is also bike friendly. One of the most popular local rides starts & finishes here on tues evenings.