Second year update: This spring has been a disaster for Chios. Every single bloom from the spring flush has balled or been bull-nosed, and the plant is a mildew factory. I have been spraying weekly with a milk/potassium bicarbonate solution to try to keep it under control, but the mildew seems tenacious on this one.
I really thought a rose from a Greek island would have done better than this here in another Mediterranean island. Weather this spring has been rather less rainy than normal, although still humid air, but again I didn't think air humidity would be a problem for a rose from a Greek island.
I will continue to hope for an improvement since Chios is so lovely when it's good.

Remember that this is the perspective of a person living in a place with lots of hot weather and dry air: I’ve had Golden Celebration for about 10 years now in Just morning sun. It has grown great with new canes every year. However, I hate it! The flowers open up from bud to fully open in one day and then the petals fall. I love to give rose bouquets to people but I can’t put it in bouquets because of the short vase life. It also has NO FRAGRANCE IN OUR HOT WEATHER (and by that I really mean all year)!!! And then to add on to that, it blooms 2 times a year. Yes, at these times it’s full of flowers but they blow out so quickly it’s ridiculous. So, this year I said that’s it. I didn’t have the guts to shovel prune it but I moved to a lesser place in the yard.