Saint-Germain: small with nice staff. They brought in missing sizes for me to try from another boutique by scooter delivery.
Av Montaigne: close to other boutiques or restaurants one might be interested in going to. Staff was nice (took care of my shopping bags etc I was carrying, offering drinks and so on)
Regarding variations on the destroyed denim. I had the same issue last season with the gray distressed jeans. They were much less destroyed than on the pictures. If you read details on LVR, it says "Intentionally worn and destroyed areas that may vary"
However, I think they vary A LOT from the picture...