Sadly, "perfect" is an opinion, not a number. My opinion is likely to be very different from their opinion, so "perfect" really doesn't tell us much of anything. This is a good example of why it is so nice to have a top quality test kit. Then you know what your numbers actually are, and are not subject to the whims of the pool store employee.
Roughly speaking, swimming is alright as long as the water is clear, you can maintain an FC level, and PH is between 7.2 and 7.8. Your long term ability to maintain an FC level depends a great deal on your CYA level, but in the short term you can simply ad more chlorine until you get a reasonable FC level.