German phrase
Was hat Ihnen am besten gefallen?
Meaning
What did you like best
When to use it
It asks what they liked most. It is polite and often used after a visit or event.
Example dialogue
Was hat Ihnen am besten gefallen?
What did you like best?
Mir haben die Gemälde im zweiten Raum am besten gefallen.
I liked the paintings in the second room best.