I am furious. I used the booking.com website months ago to book 2 twin rooms for 4 adults. £600 for 2 nights (it's in the centre of major European city). Got the confirmation. Just phoned the hotel to double check that the rooms are twin beds as the people concerned can't/won't share beds, but I've been told that the reservation had come through as 2 queens. Hotel won't change the rooms and will only provide put up beds for another 240 euros or I can pay 200 more to upgrade to room types with twin beds.
Booking.com have told me that a twin bed room is just a 'special' request and it's tough shit.
I have been through the booking process again on their website and next to the room type if gives you the option to choose twin beds. Nowhere does it say "ha - this is a joke - you only get twin rooms if you pay to upgrade - 200 more smackers please!"
I will never book with them again.