My host for a trip to Paris won't respond and worrying a few peopel have posted this month to say that he cancelled 33 or 74 days before arrival. He hasn't cancelled yet. Slightly worried. I've messaged twice this week now.
I'd suggest reaching out to Airbnb - they will attempt to get in touch with the host on your behalf. If he is still unreachable you can ask them to help find a suitable alternative (and perhaps cover any additional costs)
@Lauren10 I agree that it is worrying that he has cancelled his last two reservations and is not answering your mails. I agree with @Allison2 that you should contact airbnb to reassure yourself that all is well.