Sam
It is rare for Maximus to offer a home assessment so the first thing you should take away from the appointment is that they obviously accept that you would have significant problems attending at their offices.
We have not seen a report of a Maximus assessor failing to attend an assessment so I would hope that you will have nothing to be concerned about on the day.
The ESA Claim guides have sections on the assessment and the questions you are likely to be asked.
Best of luck.
Gordon
Nothing on this board constitutes legal advice - always consult a professional about specific problems