Well I did as you said XD
i made a reservation for 7 days, but I asked the reservation for all the days I wanted to stay.
Wait i still have my reservation email somewhere....

Thank you for reservation.
One Japanese type room has been booked for you.

Check in : 2007-08-21
Check out: 2007-09-05

15 night

One Japanese type room with common bathroom and toilet
For 2 people 6000 yen/night

Maybe she's less clear now XD

If you're not sure, ask her again (with very simple words).

Don't hesitate to ask me if you have other questions :)