No, you need a valid passport.
An identity card is sufficient.
For a Greek citizen: identity card or passport.
Yes, because Romania and Spain are members of the European Union.
Probable half day between Constanta and Istanbul.
No visa for the countries of the European Union: valid identity card or passport.
Yes, it is. Spain (Ibiza) is a part of EU, so Polish Identity Cards (in Polish - Dowod Osobisty) are accepted.
It is not necessary a visa for the citizens of Australia to enter in Romania.
I think it should be ok. Poland is a member of EU (European Union) and the polish people have the right to travel there, without the need of a passport. However if you travel from UK to Rhodes, you need some form of ID.
Of course
ask your travel advisor but isn't turkey food?
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is there a basic travel allowance required in turkey for first time flyers