One question EVERYBODY should ask and yet I am never asked is what you are billed for flying.
Some schools charge for briefing/debriefing, some dont
Some charge engines on/engines off, some dont
Some charge brakes on/brakes off, some dont.
Then ask how close to the runway are you. Imagine being billed engine on/engine off and then finding out the school is a 10 minute taxi each way, thats only 40 mins flying time. Then traffic would cut into that also.
Good luck