From SMN train station you have 3 options to get the apartment:

1 - walking (around 20 minutes)

2 - take a taxi (it cost around 15€)

3 - take bus number C2 (take it at bus station "Stazione Via Panzani" and stop at bus station "Ghibellina Pepi").

From Airport Amerigo Vespucci Airport, you can take a taxi or the airoport shuttle to SMN train station and then choose the options that you prefer to get the apartment.