Room to rent in Shinjuku

[Japoncito]

Hey guys,
I'm living in Tokyo on a working holiday visa. I've rented out a 2 bedroom apartment that i'm sharing with my friend. He is heading back to Australia on the 14th of Jan, but i'm staying for a month after that.
I am looking for someone to take his room for just one week, as I have another friend coming to stay on the 21st. I know this isn't very long but I was thinking this would be suitable for a short term tourist. The rent works out much cheaper than staying in even the cheapest hotels or hostels in Tokyo.
It is quite a spacious apartment by Tokyo standards with views of the Shinjuku metropolitan district. It is located two stations from Shinjuku station or about a 15 minute walk. The rent is very reasonable for such a place and couples aswell as singles are welcome.
If you are interested, or know anyone who may be let me know and I can discuss further details.
Thanks a lot guys, hope to hear from someone soon.