The best place to learn to fly is a quiet airfield away from commercial traffic for the same reason you would not start learning to drive car in a busy city centre. Take my advice, based on being CFI in two schools with some of the busiest commercial traffic in the UK, if you feel that gaining a PPL is just the start of really learning to fly. There is plenty of time post PPL to learn to fly into busy airfields.
Oh and good luck and enjoy your training-some good advice above about picking a school