All other questions are already answered by @Newjem, but I must say that camping at RFP is the second best I've ever been at the festival (first one is at Pinkpop).
Both time we've been there it was quiet and very close to the main stage (if you are tall enough and find a good spot you can even watch main stage screens from the camp). You need to keep in mind that you need to pay for phone charging, shower tokens and toilets (only for "comfortable" ones; standard portable ToiTois are free) there. Other than that camping is good to go.
About apartments, if you drive and consider renting a car you can try to find something in near towns - this year one of my colleagues attended the festival, lived in Pardubice, told me the road to the venue took about 20-30 minutes.
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