Im not personally familiar with the ISP location but hopefully someone who is will chime in. What I can tell you is all ATP instructors go through the same training program (ATPs) and receive the same standardization training. The purpose is to ensure all students receive the same quality and level of instruction regardless of location. Further if there’s a specific instructor someone might recommend there’s a good chance that instructor has moved on or it could simply be their personalities gelled (ie my fav instructor might not be yours).
As for parking I could be mistaken but I’ve never seen any airport FBO charge for parking so I’m thinking it’s free.