Need Advice on Frankfurt, Rhine River, Brussels, Bruges, Berlin ...

We plan on seeing the castles, Marksburg, Burg Eltz and Rheinfels (get there by day cruise or train from hotel). Where do you think we should stay, and for how many nights? We will be traveling by train only and will have one little suitcase each. ... For me, a 1-hr driving time is a 1-hr "wasted" while a 2-hr train ride is a 0-hr "wasted" while I work on my journal, organize my pictures on my computer to work on my trip picture book, review the information on upcoming ...