I'll be coming in (from Romania, but that's another story) at 5:35 PM on September 30th to Frankfurt/M, and leaving Frankfurt/M at 11 AM on October 3 back to the U.S., and was hoping to finally see the only Michelin 3* attraction in Germany which I haven't yet seen: the Moselle Valley (well, actually I haven't seen Hamburg either). I was thinking of taking the train from Frankfurt/M Flughafen to Koblenz on the evening of the 30th, then spend the night near the HBF (perhaps at GHOTEL, which seems to be within walking distance). Then the next morning, rent a car at the train station, drive along the Moselle Valley, stopping at Eltz Castle along the way, then spending the night in Trier. The next day, I visit Trier, and drive back to Koblenz, drop the car back at the train station. From there, I take the train back to Frankfurt/M Flughafen, where I stay at the airport Sheraton, and fly back home the next morning. Does this sound like a good itinerary?