Made in heaven
Definition 1 of 2
Pro Tip 1/3Positive Connotation
The phrase often implies a natural, effortless, and ultimate compatibility without any negativity. 
Joe and Anna are always in sync. They're a match made in heaven.
Pro Tip 2/3Not Literal
It's not about real heaven. It expresses a high degree of suitability metaphorically. 
Finding a job that combines both my love for art and science feels like it was made in heaven.
Pro Tip 3/3Idiomatic Usage
Use in idiomatic situations for couples, partnerships, or combinations that seem perfect. 
An old book and a cup of tea on a rainy day – that's a pair made in heaven.