Sadly there is not a great deal about Gnocchi which could be described as "good for you".
It is naturally high in fat, and more specifically, saturated fat, which is one of the "bad" fats (as opposed to the "good" fats like omega 3 found in oily fish).
An average serving of gnocchi has a huge 36% of the recommended daily allowance of saturated fat, and when you consider that gnocchi is often eaten with cheese, olive oil or red meat, that would probably be close to an entire days worth of fat in one meal.
That said, it is high in carbohydrates too, which provide a lot of energy which is great if you exercise, so it would be a good meal for an athlete, or someone with a busy lifestyle who is on their feet all day.
It also contains protein, which is important for maintaining healthy skin and hair, and for healthy bone growth in children.