がいいね

is good/nice

→ が
phrase Uncommon #12,126
is good/nice が marks what is being described, while いいね expresses approval or admiration, often translated as “is good” or “nice.” The phrase can also mean “you’re lucky” in expressions such as 運がいいね.
JA: その新しいバッグ、色がいいね。
EN: That new bag has a nice color.

でも初めて言うような口ぶりがいいね

But... I like the way you say it, as if it’s the first time.

— ビッグ・シック ぼくたちの大いなる目ざめ (2017)

察しがいいね

You're quick to catch on.

— ザ・マン・フロム・アース (2007)

音楽の趣味がいいね

You have good taste in music.

匂いがいいね

It smells nice.

発音がいいね

Your pronunciation is good.

そいつ何かを合わせるなら白ワインがいいね

If you're pairing it with something, white wine would be good.

— アトランティス 失われた帝国 (2001)