It's the first impression that potential buyers receive when they pull up at the kerb in front of the house.
Kerb Appeal - Property - UpMyStreet | UpMyStreet
Please, help me with the highlighted sentence:
Then she called the pool service, and the gardeners. She wanted them there every morning until further notice, for an hour's work every day. She needed the yard looking its absolute best. Even at this end of the market, she knew kerb appeal was king.
(She is selling her house.)
She really wanted the territory to be neat to make an impression on the buyer.