Hill Valley Café 
CLOSED! This is a really nice place to relax with a warm cup. It's a very friendly sort of place and the staff makes you feel welcome. Their customers include a lot of neighbors. Good food for breakfast and lunch made in the kitchen while you wait. Good home-baked goods. It doesn't have a lot of tables but isn't too busy outside of early and lunch rushes. Nice and quiet. The bottomless cup option works well for staying a while. The anitque store next door is interesting, too.