Not that I have been to any other Rail Station in ...

Not that I have been to any other Rail Station in London therefore cannot make a comparison, but St. Pancras International is a lovely place. The shops are bright and cheerful, some with lovely window displays. There are plenty of places to get a meal or a quick snack before catching your train and the cleanliness of the Station and the Toilets are of the highest standard. There is always someone playing the Station's piano, keeping everyone entertained whilst waiting and there is ample seating and display boards constantly updating with train times/platform numbers, etc. A very nice place to spend some time!