1 year after the rental, which I made through Booking I received an invoice from Sixt Portugal for paying exactly the same amount as I already paying saying that these are "extra rental fees", because of the high season etc. Ridiculous service, they wanted to pay me twice, they even hired a Debt Collection Agency. They did not succeed, of course, but instead of saying "We are sorry" they make it look like they made a huge gesture for me. Never again with Sixt.
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SIXT Portugal offers premium car rental services across the country, including Lisbon, Porto, Faro, and Madeira.
Book online at sixt.pt for flexible mobility solutions with outstanding customer service