itineray

My friend and I are leaving in early May for a month long trip around europe. I have posted our plan below and any help would be greatly appreciated. We are also interested in seeing some of the smaller cities as oppose to the larger cities, however you only hear people reference the larger ones so any suggestions on the smaller places to go would be great. We plan on pretty much taking a plane from country to country and then trains from city to city, but any transportation advice would also be appreciated!