Short Term (0-12 months)
- https://www.tokyoapartments.jp/
- https://metroresidences.com/jp-en/serviced-apartments
- https://monthly.homes.jp/
- https://www.oyolife.co.jp/
- https://www.tokyo-monthly.jp/
- https://tokyo-monthly.jp/
- http://www.tokyocityapartments.net/ (guesthouses + apartments)
- http://mmtl.jp/english/index.asp (hostel style)
- http://live-jpn.com/?lang=en
Long Term (2 years)
- https://www.homes.co.jp/
- https://www.realestate.co.jp/
- https://www.best-estate.jp/ (run by GTN)
- https://www.ur-net.go.jp/chintai/
Urban Renaissance Agency, a social housing scheme with 10-15% lower prices than the market. You must have all your documents prepared to use them, and be quick!
Agents
- https://apts.jp/
- https://www.gtn.co.jp/en/ (usually used by employers, and the JET programme)