Would be easier (but also a bit riskier) to get an AirBnb for 2 adults 2 small kids for that price range. Lots of the cheaper Tokyo/Japan hotels are business hotels, which mean they cater primarily for 2ppl (max) room.Hi.. Thanks.. I am looking around S$150 range.. Preferably 4 of us in one room..
I tok airbnb is banned in Tokyo?
only chiyoda-ku
Know that Japan hotel is small and not cheap. Any family room for 3A2C can recommend Budget less than $300 per night.
which city?
Thanks for the link. If not available may look for 2 Room with same Budget.If Tokyo, you can refer to this list: http://mylittlenomads.com/tokyo-family-hotels
Your challenge is not only budget, but availability for your travel dates. There are usually limited such rooms per hotel and you may not be able to get it for all the dates you need.

What's your budget? Sunroute isn't cheap as its near shinjuku station.I also wanted to visit Tokyo with my wife in January/February but I could not locate an affordable hotel. My friend also recommended me Airbnb but I found that the price ranges are similar to hotel rooms in Tokyo.
He also recommended Sunroute Hotel but the website seems to be out of order.![]()