This is the 390th most frequent Dutch word.
leuk
Pleasant, fun, or nice.
Here, 'leuk' is used to indicate that the house is nice or appealing in appearance or style.
Dat huis is echt leuk.
That house is really nice.
In this context, 'leuk' describes the enjoyable experience of the day.
Wij hadden een erg leuke dag gisteren.
We had a very fun day yesterday.
Here, 'leuk' expresses the funny or entertaining quality of the joke.