How is my rough plan for a 6 week euro trip?

Hey all, wondering if I could get some feedback on a rough plan for a euro trip I’m planning for September/October this year. I’m mainly interested in just cruising around the cities, seeing some cool historical and architectural stuff, meeting people in hostels, and so on. I am trying to design a trip where I won’t be moving constantly and have enough time to soak the location up but still pack a reasonable amount in. I haven’t accounted for all potential day trips and still need to research exactly what I want to do in each location, still a plan in the early stages that I will continue to refine.

I have some questions regarding my plan.

* How would you adjust the number of days in each city? At the moment I have 4-5 full days in each city, with some half days where I will be traveling. I know this is very subjective, but am looking for any opinions.
* Depending on the answer to the above question, should I drop one location to add more days to the remaining cities?
* In this route the most logical? I have just tried to avoid backing on myself while still going to these locations.

* Fly out of Australia
* **Arrive in Copenhagen in the afternoon and find my hostel**
* **Copenhagen**
* **Copenhagen **
* **Copenhagen**
* **Copenhagen**
* Travel day: Copenhagen, train to Berlin
* **Berlin**
* **Berlin**
* **Berlin**
* **Berlin**
* Travel day: Berlin, train to Amsterdam
* **Amsterdam**
* **Amsterdam**
* **Amsterdam**
* **Amsterdam**
* Travel day: Amsterdam, train to London
* **London**
* **London**
* **London**
* **London**
* Travel day: London, train to Paris
* **Paris**
* **Paris**
* **Paris**
* **Paris**
* Travel day: Paris to Barcelona by plane
* **Barcelona**
* **Barcelona**
* **Barcelona**
* **Barcelona**
* Travel day: Barcelona to Rome by plane
* **Rome**
* **Rome**
* **Rome **
* **Rome**
* **Rome**
* Travel day: Rome to Athens by plane
* **Athens**
* **Athens**
* **Greece **
* **Greece**
* **Greece**
* Back to Athens for a flight home to Australia

Thanks for any feedback!

How is my rough plan for a 6 week euro trip?