I was so fortunate to have been able to see the concert from such a good seat!
I was really lucky to have seen the concert from a good seat like that!
ご質問ありがとうございます。
① "I was so fortunate to have been able to see the concert"=「私はコンサートを観ることが出来たのはとても運が良かった」
"from such a good seat!"＝「とても良い席から！」
② "I was really lucky to have seen the concert from a good seat like that!"＝「私はとてもラッキーだった、あのような良い席からコンサートを観られて！」
ご参考までに。
アメリカ合衆国 
