As a reviewer who's written a few categories, I don't really mind if there's personal information in the long description as long as there is also the required information.
A example: For an Episcopal Church, you can tell me that it was raining and you saw a brilliant rainbow over the steeple but couldn't manage to photograph it as long as you also tell me that the Episcopal Church was established in 1833 during the town's settlement and the original chapel was built by the pioneers, etc etc etc. You know? Meet the requirements and then you're more than welcome to share that your great-grandparents got married in the church. In fact, in such a hypothetical, I'd love if the great-grandparents' wedding photo was added to the gallery! :)
I love a good long description. Something originally written that has flavor and style to it. I've done so much copypasta that my tummy hurts and before I head out posting new waymarks, I want to improve on the ones I've done. I'd like to warn others against copypasta (copying & pasting) and encourage them to be more original and really have fun writing. There's good stuff involved in Waymarking and writing is a big part of the good stuff.
When people bring an original voice to Urban Legends & Superstitions, it's fantastic. I have in the instructions that posters should write the Long Description as if they're telling the story to someone who has never heard it before. It's so great and there's a lot of freedom there to put yourself into it! Then we have a variable for "the real story" where people can fill in the facts and whether or not there's really any truth to the Urban Legend or Superstition.
Ultimately, you should follow the instructions of that specific category. If they say "no personal information" or a suggestion to that purpose, that should be respected. I think that there's some flexibility and, if you're not sure, then just aim for the categories where I'm officer because I'll likely appreciate the personal touch mixed with great information. ;)