HiCan you still travel by interrail from London via Paris Zurich to Istanbul with a 15-day ticket? And how good is the Belgrade-Sofia connection? ..does this go directly? and in which trains do I have to make reservations? Does the train also stop in Ljubljana? and how about changing money does it all work locally in the respective countries?Thanks in advance if anyone can answer this.Maybe someone has already made this trip. I want to drive the red route. See picture