Arisugawa-no-miya Memorial Park

Locals call it Robo Robo Park for its colorful robot tower inspired by tin toys, at the south end of Roppongi Hills.

The big Roppongi Hills hotel, with an indoor pool, and the Mori Tower, the cinema and a dozen places to eat right outside the door.

There is a little play area upstairs plus stroller access and simple food like mini pasta and banana bread.

Connecting twin rooms, pajamas to wear in-room, and a simple buffet breakfast from the café next door, right at the main crossing.

Apartment-style rooms with a kitchen and a fridge, which with small kids in Tokyo is the whole point, a quiet walk from Shibuya station.

A kids-only bakery where children go in on their own, pick their own baked treats and get their change back.