Breakfast! I am a superhost because I provide value for money, a dedicated bathroom, a clean room with a comfortable bed, and a homemade breakfast. These are all things I look for when I stay in another host's home. But the one thing my guests always mention is the breakfast.
Granted, I am retired, and I have the time to do this, but it is always so enriching for me personally to have that morning time conversation with my guests and to get to know them. It has enriched my retirement life and kept me busy and active.