Hey guys, planning to travel to tokyo from kota kinabalu for 7 days. MAS return flight 1700plus. Is that okay?

Also how is the weather like in early to mid december? Will there be snowing? What attire would be suitable? And what are the budget like for 2 person excluding flight? Is tokyo a suitable city for free and easy? And last which are the area/hotels with the most convenient location at a budget price?

Thanks so much in advance!