Meeting all of the instructors is an absolute must. Talk to as many of them as possible and you will soon see who is there to teach people to fly, and who is just building hours waiting for an airline to snap them up.
I was foolish, and didn't ask enough questions. I only flew at weekends, so my PPL took over a year and about 8 instructors.
Sticking with the same aircraft is an absolute must. I flew the PA-28 consistantly, then turned up one week only to find i'd been booked out in a robin. In the middle of nav training. I turned around and went home.