Best place to stay in Tokyo?

Hello,
I will be traveling to japan for the first time in September. I will be staying in Tokyo for one month. I will be staying in a guest house. I'm a 24 year old male and want to experience a part of Tokyo that has a good night life. Has anyone stayed in a guest house in Tokyo before? How was it?

Where do you think the best place to stay one month in Tokyo would be?

Thank you.

How exactly do you define best?

Almost anywhere is close to a subway or train station. If you want inexpensive, there are many places with monthly rates. Have you looked at:
http://www.bamboo-house.com
http://fujimihouse.jp/?lang=en
http://www.tokyoroomfinder.com/
http://www.tokyocityapartments.net/
http://www.wix.com/astroflight/accommodations

for starters?

Thank you for your response. Best means a part of tokyo that a younger gentleman would like.

I heard Minato-ku, Shibuya-ku and Shinjuku-ku are all fun places to stay. Is this true?

I was going to use sakura house to find a share house. Does anyone have any experiences using sakura house?

Thank you.

What is your definition of gentleman? This definition differs according to your generation and culture.

You should probably stay in the Roppongi area.