良さ

goodness, good qualities, merits

good, nice + -ness (the degree or quality of an adjective)
noun Rare #22,993
goodness, good qualities, merits
JA: この町の良さは、静かで住みやすいところです。
EN: The good qualities of this town are that it is quiet and easy to live in.
Declension of 良さ
良さよさ

その良さわからないわ

I don't see what's so good about it.

— 甘い生活 (1960)

外見良さかな

Probably their appearance and good manners.

— 最強のふたり (2011)

彼の良さ外見では分からない

You can't tell how great he is just by looking at him.

彼の頭の良さ広く認められている

His intelligence is widely recognized.

その後援者本物の骨董品良さが分かる

That patron knows the value of genuine antiques.

多くの外国人が歌舞伎良さわかります

Many foreigners appreciate the appeal of kabuki.

なりのカッコ良さがある

He has a coolness all his own.

狭い通りには狭い通りの良さがある

Narrow streets have their own unique charm.