For flights, I used Expedia. But since JAL are going quite downhill they are not appearing on the expedia site for whatever reason. you can still try and book tickets through
www.uk.jal.com though.
If you go over summer...be prepared to sweat...alot. Also check that your 2 week vacation does not clash with national holidays...generally everything shuts so you won't see much (as public transport is also very limited)....well this statement is true of Golden Week (last week of April, 1st week of may).
For booking the Ryokan Kangetsu, go to their website
http://www.kangetsu.com/sub7.htm and scroll to the bottom. Click "Reservation" and away ya go. We basically paid when we got there in cold hard cash.
Useful information on geting to the Inn:
1. Regardless of which Terminal you arrive at Narita, take the
Narita Express (also known as NEX) towards
Shinagawa. That'll cost you approximately 3110 yen. (remember this as you'll need to pay the same fee on the way back)
2. At
Shinagawa, LEAVE the train station and look for a credit card style machine that has the word "PASMO" on it. Set the machine to English and get yourself a PASMO card. Charge it with 2000 yen. It'll cost you a total of 2500 yen (500 yen for the card 2000 for fares).
3. Go back into
Shinagawa train station and take the
Keiin-Touhei Line (marked blue) towards
Kamata. Use your PASMO card to get through the gates (jut hover it over the reader).
4. At
Kamata find the
Ikegami Line and hop on that train.
Chidori-Cho is your third stop.
5. Hop off at
Chidori-Cho, turn left and walk across the train tracks towards a shop called "AM-PM". Turn left down the alley with the cigarrete machine.
6. Carry on straight and you've reached the Inn (up a bunch of steps).
Also, for minimum amount you need, £1600 will get you your room at the Inn, your flight, NEX travel, PASMO with 1000yen daily travel allowance and your food everyday for about 2500yen for a 13 night stay. Food is cheap as long as you know where to go buy...ie eat like a local. Ramen shop was about 680-780 yen for a bowl which fills a hole.
We found a place in Ikebukuro (I think) that did us Curry, Rice, Soba and Miso soup for 580yen!
Anything else you want to know?
Ahh and travel light....there is alot of steps/stairs involved and moving around with a full luggage can get tiresome quickly. Oh and it'll cost about 500yen to wash and dry your clothes.
NOTE: If you do stay at the Ryokan Kangetsu and you don't mind sharing, have a room for 2 people - it works out cheaper. Also there is a blue card in the room; leave that on your bed (please make your bed in the morning too) and the staff won't change your bed sheets but will give you a nice gift.