It's very nice that you are here. （还好有你在这）对，很礼貌lucky to have u / lucky you are here 也不错，很口语 还好有你 in good English 也可以说:I'm so glad/happy that you're here （with me/by my side）= 还好你(在我身边)It's so good to have you around! (= you're fun to be with)We are lucky to have you or (It's) Great to have you here! 都意味着 = 还好有你的帮助和支持 I feel so happy because of you. （因为你我感到很幸福）不是这个意思，比如说：You finally made it, I feel so happy because of you. = 你终于成功啦 我真的为你很开心。