Could you explain what you mean by "charming" here? It's a bit unusual to call an airport charming, but it's OK if you know what your doing. You don't need the word "very" before "marvelous",2. It has a charming airport, whose design is very marvelous.
I'd use "at the airport", but please wait for another opinion. I'm not sure "in" is wrong.3. The receptionists in the airport are friendly.
Besides, there is an impressive piece of architecture called the Twin Towers.4. Besides, there is an impressive architecture called "Twin Tower".
Are these sentences supposed to make a whole? You enumerated them, so it's not clear that they form a contiguous piece of text. Do they?