Did any of you guys had this experience? - Yes. There's nothing happening, as Moroccans do not celebrate New Year. There is a crowd of tourists in Djemma El Fnaa square, where the usual entertainment continues. But the only parties are in restaurants and nightclubs that are either tacky, expensive or both.
Do you think it will be very cold? - Yes, December nights in Marrakech can get pretty cold.
We're looking for some place nice, cheap and confortable. Any suggestions? - Hotel Sherazade (www.hotelsherazade.com), but make sure to book as early as possible. Christmas and New Year is a bit of a peak period in Marrakech.
driving should be nicer I guess - Depends where you're coming from I guess.