Budapest to Amsterdam starting August 28th

Hello warmshowerers!
It was great to find this website. We are Nathan and June, taking a three month tour of Europe starting in Budapest along the Danube trail, to the Via Claudia Augusta, and then hopefully around the coast of Souther France, Spain, Portugal, through Paris, to Amsterdam. We have been very grateful to be part of such a wonderful bike community in Minneapolis, and hope to find the same around Europe. We are looking for suggested route along this path, but are completely open to any suggested routes in Europe. Any tips, pointers, advise would be very helpful. Also, riders welcomed! If you are traveling along this way around this time, feel free to post and come along. We are looking forward to meeting tourers along the way. We will be camping the whole way, so suggested routes with the options of free camping would be great. If you have any questions about trails in and around Minneapolis, feel free to ask also, we will do our best to help.