My translation is this: I think your accommodation should be arranged before your coming to Japan. I would recommend you that we are to reserve a room from a monthly apartment for you, which will cost from about 70000 yen to 80000 yen and we will pay temporarily for you. The person is saying that he can make an arrangement of your accommodation if you like. So, if you agree with it, you can write like this: それで、よろしくおねがいします。 (That'll be fine. Please do it as you suggested.)

I booked in the hotel according to the schedule table before coming to Japan, I've prepared about 7-8 ten thousands yen, but l make arrangements for monthly apartment here, I think I'll need that.. This is what I think that it's the right translation