The coffee at the cafe I entered by chance was delicious
I had some amazing coffee when I stumbled across a new Cafe by chance
うんうんうん!こういう事はとても嬉しいですね
The coffee ( あのコーヒーが)at the cafe I entered by chance ( たまたま入った お店)was delicious(美味かった)
I had some amazing coffee( すごいコーヒー飲んだよ) when I stumbled across a new Cafe by chance( たまたま新しいカフェ に入った)