The seat: I was in Car 6, seat 2-A. It was a clean, luxurious leather seat with magnificent views of different suburbs and the countryside of Tokyo, passing through farms and towns. The padding was soft and the tray table was big.
Price: We paid ¥3240, about $45. Well worth it to get to Narita so efficiently and stress-free.
Travel time: 1hr 58m.
Fellow passengers: Only one other family with a child, so it was relatively quiet. The train itself was almost silent.
Food and drink: None on this service.
Entertainment: Free, fast Wi-Fi was available on this train which was great. Other than that, it was just the view.
Service: The only staff member I saw was a patrolling conductor.
Toilets: Clean and spacious.
Luggage: The NEX has a spacious compartment at the front of the car where you safely store your luggage. There were also overhead bins, just big enough for a backpack or a handbag.
Final word: The Narita Express is a great and efficient way to travel to the airport in very little time. The train only stops once en route, at Tokyo Station, and from there the time flies. I would definitely use this train service again.