Hello Simon,
Welcome to Airbnb.
As to your question, my suggestion would be to provide more detail as to the level of autism involved and whether you would also be present. All hosts need to be well informed about the actual level of disability, actual requirements such as those mentioned i.e. moving furniture about etc, length of stay, the level of support that both of you will need. When choosing a place to stay, you will need to bear in mind safety features that a listing has to offer, in addition it is best to stay in a listing which has emergency services nearby should it be required.
Lastly, may I suggest that you fill out your profile page with info about yourselves and provide a picture as well. This provides a community feel and brings people closer.
Do contact me if you have any further thoughts on this.
Kind regards,
Claudia