To get to Reims in your apartment the train is the easiest because you are 5min from the station Center without its disadvantages! You will also have access to the tram and buses nearby. If you arrive by plane, the easiest way is Paris Roissy airport. There are regular trains between the airport and Reims it takes 30min of train. And by car it is very easy by the exit Reims center to go to the apartment you can park in the street or if you prefer a covered parking you can go to the parking Effia of the train station of Reims.