もし、一つだけ願いが叶うならば

If you were granted one wish, what would you wish for?

If I were granted one wish, I would want to live in a house dedicated for the smooth flow for housework including a sauna.
I think that’s convenient and a sauna that I love going to closes to me.

This is my colleague’s one wish🤣

もし一つだけ願いが叶うなら何を望みますか？

もし一つだけ願いが叶うなら、サウナ付きの家事導線が整った家に住みたいです。
その家は便利だし、私が大好きなサウナにいつでも行けます。

この願いは私の願いではなく、後輩の願いです🤣

Are these sentences correct grammatical?
How would you say them naturally ?