As a Hillside regular I feel 4/5 stars is not quite the perfect rating - I wish I could give them 4.5 stars as 90% of my experiences with the food and service have been excellent.
Those experiences that comprise the 90% include breakfasts, lunches, and dinners. Amazing pancakes, best bacon in the valley (seriously, big props for the bacon), huevos rancheros yum, chilaquiles to die for, awesome burgers, great beer selection, and I am in love the Cocina 10 items! The servers are friendly, knowledgeable about the menu (both food and beverage), and make the overall experience at Hillside enjoyable.
The other 10% - the bad - have occurred in the mornings on the weekends when they're in the middle of a rush. New rule - if I have to wait more than 5 mins for a table at Hillside I have to walk away. They just don't seem to properly staff those peak times and both service and food quality suffer.
Final words... outside of 8:30am-10:30am on Saturday and Sunday I will continue to visit Hillside for any meal of the day. Great food! If you haven't been... go!