の良さ

the appeal of

→ の
phrase Rare #24,872
the appeal of Follows a noun or phrase to refer to its good qualities or merits; the exact translation depends on what it describes.
JA: この町の良さは、静かなところです。
EN: The appeal of this town is its quiet atmosphere.

外見や品の良さかな

Probably their appearance and good manners.

— 最強のふたり (2011)

多くの外国人が歌舞伎の良さがわかります。

Many foreigners appreciate the appeal of kabuki.

彼の頭の良さは広く認められている。

His intelligence is widely recognized.

狭い通りには狭い通りの良さがある。

Narrow streets have their own unique charm.

その後援者は本物の骨董品の良さが分かる。

That patron knows the value of genuine antiques.