@Hillary15
It seems your host is "hosting" from a building that does not allow the tenants/owners to sublet or have short-term stay rentals (basically what Airbnb is).
I actually stayed at a place like that when I was travelling Japan. On the day of check in, the host told messaged me that if the guard out front asks I should say "I'm staying with my friend 00000 in unit XX" (no idea who 00000 was - not the name of our host, and we were not staying in unit XX) Also there were signs all over the house warning guests not to open the door if someone comes knocking because it could be someone from the residents' committee and the host could get in trouble AND the guest might also be inconvenienced.
I suggest you contact Airbnb, explain the situation, and ask that your reservation be cancelled with no penalties so that you can make reservations elsewhere. Good luck~