The symptoms depend on which part of his brain was affected by the stroke. While Alzheimer's usually begins with memory problems, vascular dementia more often begins with poor judgment or trouble planning, organizing, and making decisions.
Landlords are not responsible for the loss of personal property of a tenant after a fire. This is because the landlord had no control over the fire or over what property the tenants decided to keep in the rental unit.
In order to hold the landlord liable, the tenant will have to prove each of the above elements. Take the example of the broken stairwell, above. Assume the tenant took the front stairwell, stepped on the broken step, injured himself, and that the step had been broken for several months.