Ask for as much info (inc. photos) as you want on the school, housing, contract details, etc.

In my experience (both as an employee and employer) people are happiest in their work when their expectations for the job meet the reality of the job. Part of the responsibility for meeting expectations is of course the job of the school who should ensure that they meet their end of the bargain and provide the teacher with indepth info about the role but also the employee should do as much research and probing into the position as possible so that they know what they are in for.