I will be using this sentence a lot in Poland. I like the fact that this course focuses on key phrases that anyone who will be traveling to Poland or living in Poland needs to understand and be able to use.
Can't "ideal" be used here?
It can, it works.
In English or Polish?
Can we also say, "Dlaczego? Dlatego, ze jestem idealny!"
Yes, it works.
Could you say 'doskonały' here too?
It is accepted, although I don't love it... it feels to me like it could really use some noun to describe.
When you think 'bout this in an Hetalian way, it actually hears pretty Polish XD