Options to live in tokyo as student

Hii everyone
I am an international student soon to be studying in Tokyo.
I applied to university dorm but couldn’t get through so adcom told me to reapply around 2 months later.

So now i have to look for other options i did my own research it seems oakhouse and sharehouses arw good options but your experiences could help
I just have 3 requirements
1. Flexible contract that i can cancel with 1 month or less notice in order to shift to uni dorm eventually. Also it should be possible to register as resident address in city office i have heard that short rentals are not eligible to register at city offices.

1. Budget max 80-90k yen per month including utilities hoping a clean and safe environment (better if can use IH in rooms) no key money and other upfront

2. 40-50 minutes max Commute to chiyoda tokyo
   I’d appreciate any tips on what are some of good options.

PS – i heared horrible reviews for sakurahouses and did some research on sharehouse tokyo website but any tips of experience would be helpful

Thanks in advance