Average RM400/day should be enough, provided that you don't simply try on any finger food on the street. Just bear in mind that their dinner is much more pricier than lunch. We went there 2 yrs back (2 adult + 6yr-old kid) similar to you. Don't think that you will like to hunt for bento (packet food) at the supermarket every late evening waiting for discounts. What we did last time was we make sure we have good breakfast (hotel breakfast) to reduce your crave to hunt for food, and big lunch. Their lunch set prices are quite compatible with KL Japanese restaurant (but with better quality and portion). Having 2 sets basically make 3 stomach happy enough. Dinner can settle with convenient shops.

the airbnb is for which part of japan?

Oh okay, i think i can guess which one in kyoto.

For the one near to Shin-Osaka, is it the one by chie?

ah okay, i have booked the one by chie. when is your trip?

I will be travelling to kansai on november too.. stay in airbnb in kyoto somewhere near gojo and kiyomizu-gojo too

any chance it's the same airbnb? hehe

i went from 27th nov last year and the colors at kyoto are marvelous. the best was at kinkakuji

Hope the apartment is OK.

Quite unsure when doing the reservation via airbnb, however since the rate in kyoto is super peak, no choice lo..

I rather save the budget for food and onsen ryokan. hehe

Around 15 Minute for each pass during process. If no Q

>>my budget for makan for my coming trip rm300/2pac/day.. doable?

Yes, for 12D (12x3=36meals), Per pax, i allow breakfast Y600x12=Y7200; mid-range lunch/dinner Y1000x20=Y20000; and high range lunch/dinner (sushi etc) Y4000x4=Y16000;

total Y43200x2pax=Y86,400, say Y87000/36meals for 2 pax = rm258/2pax/day
>>i plan to bring only rm5k worth of yen for my 12day trip (makan/transportation/admission fee)

rm5K = <Y150000 for 12 days? i deeply DOUBT so for 2 pax!! if u meant bring rm 5K per pax, then OK..makan oledi Y87000(estimate), transport/ad fees very subjective la, if no go anywhere, maybe can.

don't count of credit card unless u all meals/ shoppe at 5-star

I think u need to activate your atm card in ATM machine in malaysia for oversea usage..

I tried my maybank card last time.. so far no issue, however not sure the limit thou

Kok Kong in KL have winter clothes for kids. I buy from there.

i got so much trouble with train gates... since not much preparation.. (my own mistake) .. fortunately, the japanese is really kind and assist me all the way to the train gate.. although he might be going to the other side.. make me feel embarrass and thankful at the same time... a few of them claim they work in Malaysia before.. kind of cool

IIJMIO was my 1st choice but have to get it from BIC and certain store.
When you bought it at Y3200 ? i read 1st page it stated around Y4100, and it's depends on shop to sell at difference price.
my concern is i will be arriving late in airport and shops are closed. and on next day i will be taking 6am train and shops yet to open 
Reaching Kyoto morning 8am and have plan to start touring but BIC opens on 10am only.