I went to the 3 of them :
1)Turkey is beautiful (outside Istanbul) Istanbul itself is not so worthy ,but you can easily travel to Cappadocia by domestic flight also take day trips to either Bursa or princess island
Not that clean
Relatively it's the cheapest among the others
2)Prague:it's beautiful city ,a lot of attractions,night life, street walking is good and it's a lively city even at night
It's considered cheap in comparison to other European countries(Non Euro Country)
3)Amsterdam

I simply love all about it ,the infrastructure,buildings designs,river,night life,riding a bike and you can go day trips also for the windmills and even to Belgium by train
It's expensive ,but it worth