We have stayed at Paris, LOVE IT- great location, nice rooms, love the shops, highly recommend it. We have also been there in January, weather is VERY unpredicable, we have been there in Jan when it's been 60/65, and been there when it's BEEN FREEZING, had to wear Northface Jackets, so I would say tell him LAYERS, expect either extremes. Love Vegas in the cooler weather, it's so easy to walk around everywhere, actually LOVE VEGAS in ANY WEATHER!!