I don’t have specific advice, but twice in the last year I stayed in historic buildings that were recently restored and converted into hotels. They maintained the fabulous ironwork of their original era, but they were paired with very clean-lined, modern furnishings and lighting, and the juxtaposition was stunning. I think Beverly’s advice to be consistent and have a vision is key. If it were me and I wanted to feature these beautiful railings I’d if at all possible bring in a designer. I’m curious to find out if the railings are a definite style. I saw a bit of French, art nouveau and maybe even a little English arts & crafts. Definitely too delicate for Tuscan. Congratulations on your beautiful new home.

It looks like a metal door that has pitted. We don't have enough information to guess at the reason for the corrosion.

That looks like old mottled green leaves that could be removed and let the new leaves take over. I snip them off so the branch doesn't tear. You'll feel so much better when last year's leaves are gone. The new reddish leaves look good.

Trumpet vine , Campsis, perhaps. https://landscapeplants.oregonstate.edu/plants/campsis-radicans