If something is superconvenient, it is extremely easy and helpful to use or do.
Superconvenient things make life easier and save time.
Examples:
Having a microwave in the kitchen is superconvenient.
The new bus stop is superconvenient for me.
The superconvenient store is just around the corner.
It's superconvenient that my best friend lives next door.
A teleporter would be superconvenient for traveling.
The superconvenient app helps me find the best deals.