Aesthetic-Usability Effect.

The aesthetic usability effect is where a user will perceive an attractive product as easier to use than an ugly one.

Emotion & Design: Attractive things work betterDon Norman
Aesthetics MatterUX Collective
What is beautiful is usableInteracting with Computers
1000+ images about Aesthetic-Usability EffectPinterest
The Aesthetic-Usability EffectNielsen Norman GroupJanuary 19th, 2017