The Brussels Airport is efficient and flows really well. For me, having public transport directly connected to the airport is a great added benefit because as a tourist you always want to be easily able to connect and this place as both a great expansive bus and train services operating at regular intervals helping you connect to Belgium and other countries! That's why I love Europe. Downside, lack of English instructions can be hard to navigate different levels as well as the train stations and which train/platform to go to. I love that Belgium retains their language heritage but as a main international hub, some more tourist friendly assistance would be welcomed!