Is my 3 week Europe Itinerary and budget realistic? Berlin, Prague, Krakow, Budapest, Slovenia, Croatia?

This summer me and my boyfriend would really like to travel europe by Interail starting at the beginning of September and spending about 3 weeks travelling. We live in the UK and are interested in purchasing either the £289 22 day continuous rail pass or the 10 days within 22 days pass for £229. We are both... show more This summer me and my boyfriend would really like to travel europe by Interail starting at the beginning of September and spending about 3 weeks travelling. We live in the UK and are interested in purchasing either the £289 22 day continuous rail pass or the 10 days within 22 days pass for £229. We are both students and so would ideally want to spend around about £800 pounds (each) on the trip covering everything including accommodation, food, and activities or up to a maximum of £1000. In terms of accommodation we are intending to use hostels although are willing to camp if strongly suggested. In terms of how we live we are looking to self-cater for ourselves with occasional treats such as eating out occasionally enjoying some of the night life and visiting as many as the sights as we can afford.

The route we are looking at covering follows:
Berlin (4 days) - either fly out to from the UK or add paris to the journey and use a night train to get to Berlin
Prague (3 days)
Krakow (2-3 days) - one day spent visiting Auchwitz
Budapest (1-2) days - Stopover and visit the famous baths
Slovenia (4 days) - one day in Ljubljana, one day visiting Bled, One day visiting Lake Bohinj and Mount Vogel, one day visiting the caves at Postojna
Croatia (4 days) - 2 days dubrovnik, 2days traveling down possibly stopping in Split or taking an over night ferry from Rijeka

We are not sure whether or not the suggested time periods in each place are too long or short to experience the places. We want to experience as much as we can but at the same time enjoy the places. Initally we were looking to include Paris and then Amsterdam before Berlin but thought this may stretch the cost and time? What do you think? Also we were wondering if the route may be better in reverse in terms of weather?

As you may be able to tell this is our first time travelling Europe although we have visited various parts of western Europe before. We are looking for any suggestions and advice that may be appropriate and also any additional or alternative things to see along the way

Thank you
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