"Lol, booking.com? I think I've got a story for that! Has anyone else had issues with their site auto-booking hotels at random times even when you've specifically cancelled your reservation?"
Just used Booking.com for a trip to Berlin and I gotta say, their service was solid. Easy to book a place, payment process was seamless, and the support team was responsive when I had a question. Overall, 4.5/5 stars from me.