From Munich-Kufstein-Innsbruck-Landeck by car: You leave the S16 in Flirsch than you just follow the road. 

The flat is just opposite of the fire brigade and the doctor.

 

If you arrive through the Arlbergtunnel from Lindau, Bregenz, you leave the S16 after the tunnel.(Exit St.Anton / Pettneu).

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If you are driving above the Arlbergpass just follow the road until you reach  Pettneu 60 Arlalpsapart