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I'd suggest that you telephone the school - say you'd like to pop in to talk about taking lessons for your PPL and that you'd like to speak to an instructor. They'll probably tell you to come in any time.
And also say that you'd like to speak to a student when you pop in - there should be one or two just strarting or finishing a lesson if you are at the school for any length of time when you visit - unless the weather is pants that day. That gives you the chance to ask one whether he/she has ten minutes for a chat.
Don't be shy about asking! We all love the hobby and are all too happy to give anyone who is prepared to listen the benefit of our (in)experience.
If you feel that the school is not helpful or friendly in any way - check out the competition.
And in any case, most schools have no difficulty in arranging a change of instructor if you don't feel comfortable with the one you start with - whether it's a personality issue or a progress issue - it happens all the time, so you shouldn't be concerned about it.
And don't forget - if you don't get on with the school, you can always move elsewhere - your training records go with you - you are not stuck with the same school for ever.
Alexa