What's wrong with "The restaurant is not here"?
Since it's the restaurant, it would require az: "Itt nincs az étterem" or "Az étterem nincs itt", etc.
Why can't learn little easier? This way i can go to school and learn Hungarian 3 years.
Even if you have a "personal Hungarian trainer" it will take you many years to see through the many difficulties of this beautiful language!
And when you start talking to Hungarians, you will find out how difficult it really is...
Been learning for 6 years (off DL) - and only just getting to the point where can understand normal conversations and take part. DL is a start - but only the very beginning.
Why is "There is no restaurant" wrong?
"There is" is like a phrase in English. We are talking about a place, "here" to be more accurate.