If youre doing a month+ stay in tokyo, hotel bills get insane and airbnb selection is trash after the minpaku law. Locals use different rental sites entirely.

Suumo and homes.co.jp are the big ones but theyre japanese only. Gaijinpot.com has english listings but limited to overpriced gaijin housing. Your best bet is facebook groups - 'tokyo apartment rental' and 'sayonara sales tokyo' have daily posts from expats leaving.

Leopalace21 does furnished monthly rentals starting around ¥80k/month including utilities in areas like nakano or koenji. Not fancy but functional and they speak some english. Much better than paying ¥15k+ per night for shibuya hotels.

Avoid anything requiring key money (礼金) or japanese guarantor if youre just visiting tokyo - stick to furnished monthly or sakura house guesthouses.