Upon arrival, all passenger vehicles with drivers were staged near the aircraft. Line service technicians facilitated a quick departure for the passengers and tended to our needs. I was especially impressed with the supervisor who took the time to explain to his colleague, in very clear terms, the process for servicing the lav. He nailed the steps and even gave pointers on properly securing the flapper valve, as well as evacuating the fill drain to avoid freezing and hassles at a downline station. All line staff were efficient and courteous. The next morning was no disappointment. The young lady at the counter was super helpful and had a great attitude. She was quick to anticipate our needs and movement through the facility, providing seamless access through the door. I believe that such success comes from hiring the correct people and providing good training. I felt that the service we received was exceptional because of those attributes. Thank you.