(最好是能免费入住你们酒店)翻成英文

It would be best if I can lodged in your hotel free of charge. (It would be best是"最好"的意思, would be的时态这里表示虚拟,期望)

it will be better if i can stay at your hotel for free

It will be appreciated that I/We could accommodated in your hotel free of charge.

it will be better for me if I can enjoy a free stay at your hotel.