Housing for a year of Language School, any advice?

Please remove this if it's been asked numerous times but the Wiki didn't really clear things up for me and I didn't see many other posts with regards to only staying for a year.

I'll be going to Tokyo for a year of language school, and managed to book a Sakura House room in a shared house for 450 euros. However, it's only for a month, I understood I'll get a residence card and I need to write my address on it. So once the month is up (since I couldn't rent it for longer), I have to find another room.

What are my options, apart from jumping from place to place? Are there any short term rentals that might rent a single room for the remaining 11 months after I leave the first room? Can I easily change my address on my residence card once I move?

by StrengthInMind