Nothing, the office is barely visible, remotely located in an industrial area which closes at 6pm. More than 30 min taxi from Antwerp train station. Just skip it!
Difficult to find office, remotely located. And most importantly closed when I arrived at 18h30 despite being advertised as "24h pick up and drop off". The emergency phone no on the wall doesn't answer. Sixt wont refund my pre-payment because "you have to book out of hours appointments before". Thanks, but it was not mentioned anywhere when I booked! What a scam this is! Just forget Sixt in Antwerp! I ended up paying 5 times the price of the rental in order to get on time to my appointment, well 6 times with the pre-payment! Résultat j'ai payé 4 fois le prix de la location en taxi pour être à mon rdv à l'heure. Passez votre chemin avec Sixt à Anvers!