As your itinerary is about 20 days including flights, the best value for money for you would be to acquire a 15-day continuous Eurail pass, which will let you travel at your pleasure across the five countries on your list. The cost of this works out to €844 (roughly â¹68,000) for two second-class passes, with a 15 per cent discount thrown in for two persons travelling together. This should cut down train fares considerably given how much train travel you are planning to do. Since your trip is for 19 days and your pass is valid for 15, you’ll have to bookend your trip with activity for about three to four days that does not require train hauls. Local sights in Paris and Rome should certainly take care of that if the order you’ve given me is indeed the way you want to enter and exit Europe. The Loire Valley and Versailles can be done as day trips as you say, and there are excellent guided tours from Paris (City Wonders and France Tourism). From Avignon, you can easily take local buses to Gordes via Maubec– Coustellet, which costs €57. For Roussillon, there are buses with a change at Apt–Gare Routière, which will cost approx. €5–6.