Cheap ($24/hour for double room, $15/hour for single). Pretty comfortable. With air-cond. nice way better option to spent night in Dubai Airport, than to sleep on the carpets (how some people do) ;)
It is 65dirhams (18USD) per hour for sungles now. Also available for families up to 2 udults and 2 kids (by addind one more matrass) and will cost 25USD per hour.