Jimena G.
Our apartment host cancelled the Booking.com reservation by email the day before, without explaining why. We assume it was because we knowingly booked twice. That reflects badly on the apartment management. In a rush, unable to find Booking.com's customer service number, we called a fake Booking.com number and were charged an extra €400 to keep the reservation. It was a scam. Don't pay in that situation. Booking.com is also at fault for not making a customer service number available, at least for emergencies.

