了解しました。
とても狭いお部屋でよろしければ、ぜひご利用ください。
お子様お二人とのことですが、追加人数は「一人」で構いません。
それでは、良いお年を!
Certainly. Please come and visit if you are happy with this very small room.
You mentioned that you have two children, however, it's fine to mention 'one person' as additional people.
Have a Happy New Year!