Questions should include,
How many patients has he/she seen fully recovered and what did they do to recover? This is not the ADL recovery.
What clinical trials are going on right now that the patient would be a good candidate for?
What treatment options have been discovered in the last 5-10 years? This is to determine if he/she is up-to-date or if you will have to do all this research yourself.
Who are the best therapists working in your clinic for stroke rehabilitation and why do you consider them to be the best?
What books on stroke recovery do you recommend?