Tokyo is two worlds at once: the neon of Shibuya and Shinjuku against the calm of Senso-ji temple in Asakusa or the Meiji shrine next to Harajuku. In between, market sushi, themed cafés and the electronics of Akihabara.
It deserves 4 to 7 days: distances are deceiving and the metro is your best friend. Grouping each day by area (Asakusa–Ueno, Shibuya–Harajuku, Shinjuku) makes all the difference — and the AI does it for you: a day-by-day itinerary, map and estimated budget in yen.