Put Your Head On My Shoulder is my go-to choice if I'm feeling down. Heck, just the first episode has me smiling.
Terius Behind Me - a spy hiding from his own government develops an unexpected friendship with the young mother across the hall in an apartment complex. The National Intelligence service can't compete with the playground parents. Cutest six-year-old twins ever!
The Go Back Couple - a divorcing couple find themselves back in university directly before they met. Mentally they are still themselves 15 years later.