This is an extremely specific question, but I appreciate any input.
As part of my 5 days in Frankfurt, I plan to spend all day Sunday, June 24 in Eltville, touring the town and the monastery Eberbach, hanging out at the wine bar by the river, maybe even a short bike ride. I am very sorely tempted to also get a ticket to the opening concert of this year's Rheingau Music Festival, held in the Eberbach cathedral that very night. The festival runs special shuttle buses for the concert to/from Wiesbaden Hauptbahnhof, from which it's easy to get back to my accommodation in Bornheim. However, I won't get back until between 11:00 pm and midnight, transiting through Frankfurt Hbf, probably changing at Konstablerwache. I expect the train from Wiesbaden to Frankfurt will be full of similarly-aged classical music lovers, but after I switch to the S-Bahn, I'll be on my own.
I'm short, female and middle-aged, well really 2/3-aged, not middle. I'll be traveling alone. However, I speak German and am very comfortable on the trains and S-Bahn. I'm also an ex-New Yorker so fairly street-savvy, but useless at physical self-defense. Should I be concerned for my personal safety wandering around alone through Frankfurt train stations on a summer night? I'm not very concerned right now, but if you think differently, please weigh in with your thoughts.