I'm gonna do it this year but i haven't decided much more than that yet. I'm probably going for the 10 days in 22 pass.

What i want to know is:

How long is ideal to spend in each place, on average?
Where are the best places to go?
Any general interrailing tips?
How much will it cost?
Best time of year to go?

I thought of this route earlier, in my head:

london > paris > barcelona > south of france > northern italy > croatia > budapest > prague > berlin > amsterdam > london

But that's probably a bit ambitious isn't it?

I already know that this website exists: http://www.seat61.com/
And these old threads:

http://drownedinsound.com/community/boards/social/3115266
http://drownedinsound.com/community/boards/social/3356917
http://drownedinsound.com/community/boards/social/4181584
http://drownedinsound.com/community/boards/social/4183722

and ideally i'd like to get more replies than this:

http://drownedinsound.com/community/boards/social/4191603

Should i just try and concentrate on a part of europe or a big tour or what I JUST DON'T KNOW. And if i only have 25 days of leave and i spend nearly all of it on this i'll probably die during a six month stretch with no leave, and i don't want to die yet.