Advice on Finding a Home in Japan

Hello! I am moving to Japan due to acquiring a new job that requires me to be in Japan. I am looking to move to Tokyo by the end of the month now that I have my visa in hand. I am hoping to start looking into homes over the next couple of weeks so that I can quickly find a place and move into it within a week of getting to Japan. (The company would like me to start working approximately a week after getting overseas, and it's a work-at-home job, so I'd like to have a comfortable place by the time I start.)

As such, I was hoping folks could help with some recommendations about how to go about finding a home in the Tokyo area. A past search introduced me to Omakase Helper, whom seems like they would be a good real estate group to work with. My company also recommended GaijinPot Apartments, which seems to involve a more direct contact with the owner/management group. Does anyone know about either of these two sources, or have recommendations on a good source for finding a home?

If it helps, I am looking at the West Side of Tokyo. I'm thinking something in the Suginami, Setagaya or Ota areas. I appreciate any advice or feedback!

by RikBardoon