What's way of saying someone is posh that isn't rude? And without being over-aggrandising?
Well, posh isn't considered a rude term in itself, nor do I think it excessively aggrandizes a subject, but if it's not the word you're looking for, this should be of help: http://www.thesaurus.com/browse/posh
I googled it and found https://en.wiktionary.org/wiki/posh
Stylish, elegant, exclusive (expensive). After the performance they went out to a very posh restaurant.