First floor is smaller than the other floors. The ceilings are taller which is nice. There are more single bathrooms. One of the bigger common rooms of the building is located on the first floor. You don't have to wait for the elevator or walk up/down the stairs during a fire drill
On the other hand, the other common room on the floor, there is no kitchen. There is just a microwave and fridge. So if you want to cook anything, you have to go to another floor.