Go/work like a dream
Definition 1 of 1
Pro Tip 1/3Positive Outcome
Use when you're happily surprised by how well something worked out. 
I was nervous about the new software, but it works like a dream.
Pro Tip 2/3Metaphorical Use
It's often used metaphorically, not just for physical or mechanical processes. 
His approach to problem-solving goes like a dream.
Pro Tip 3/3Informal Setting
Best suited for casual conversations or informal writing, not in formal documents. 
Our road trip went like a dream; we had no traffic at all.