I think Jiko's is rather a bustling restaurant....good food, but not very quiet or at least that has been my experience when I have been there.....waitstaff hustling back and forth, and just lots of people.
I remember, although have to admit to not having been there lately, that Artist point was rather quiet, beautiful decorated and just sort of calming...I like that as Romantic. I just think since all the restaurants are so busy now that it is hard to find one that would qualify as Romantic....beautiful ambiance, good food, not real noisey, slower paced...great service...I could go on and on....maybe these are my terms for Romantic...