What a lovely volunteer! I have a sweet autumn clematis (terniflora) that looks something like you Armandii and it has a vanilla-like scent. The flowers are small but numerous.
I also have an arbor over my garage that I have planted the Armandii to intertwine with climbing hydrangeas. Both are just now getting to the top of the arbor. Hopefully next spring/summer I will be able to post pictures.
They are beautiful. Do you know the name of the top one? Is it Nelly Moser? I may have to get that. And are those morning glories from this year? If so, you are way ahead of us.