Part of the experience of Japan were the varied hotel experiences I had. Heres a summary of the places are stayed in Japan, with the highs, lows, pics, and websites

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Tokyo - Shinjuku Kuyakusyomae Capsule Hotel
http://www.ars-shinjuku.com/about.html
Style - capsule
Location : 5 mins from Shinjuku Station and Studio Alta east exit. Branching off line for
many metro lines, and trains to major cities like Osaka/Kyoto. JR Yamonote
circle line and Chou Express to Tokyo Stations included in JR pass.
Very difficult to find when you first arrive
Nightlife : one if the busiest in Tokyo, lots of neon lights and billboards, strip clubs and husslers, pinochet arcades
Room : capsules stacked two high, included tv with 10 japanese stations, shelf, mirror, roll down bllind
Clothing : Japanese style robes provided with all toiletries with unlimited refills (towel, shampoo, soap, toothbrush, razor, shaving cream, comb, hairdryer)
Bathing : communal sit down showers, hot tub, massage tub, sauna
Clientele : mostly japanese businessmen, hardly any tourists
Gender : mens only
Food : restaurant with eggs breakfast or cooked fish available for purchase
Storage : lockers provided and seperate room for large luggage
Power outlets : no plug outlets to recharge batteries except at reception desk
Language : reception all speak good english
Extras : clean set of clothes for purchase next day (shirt, tie, socks, underwear)
Pros : best authentic japanese capsule experience, great atmosphere
Cons : roll down shade still has light from hallways, some noise from other capsules
Recommend : yes, would definately stay again

video : Tokyo Shinjuki Capsule Hotel
http://www.youtube.com/watch?v=9Dzm8l5X xRM

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Kyoto - 9 hours
http://9hours.jp/details/index/ (click on each picture for details)
Style - capsule
Location : at main downtown intersection with department stores, metro station, shopping arcade
Nightlife : walking distance to Gion and Geisha districts
Room : alternating capsules stacked two high, no tv or shelf in capsule
Clothing : sleeping jumpsuit with slippers provided, one set of toiletries and towel and no refills
Bathing : private shower stalls, no communal tubs or sauna
Clientele : tourists and japanese students
Gender : dual sex but separated by floors
Food : no food services
Storage : lockers provided and ask reception to store large luggage
Power outlet : one socket in capsule
Language : reception usually speaks good english
Extras : capsule has programmable light to power down/on in 30 minutes to simulate sunrise/sunset
Pros : very futuristic space age look, great to take pics, capsule and hallway are completely dark for sleeping
Cons : too sterile and ikea looking, no atmosphere or social areas, not a real capsule
experience, time you 17hrs from when you check in, a bit difficult to find at first
Recommend : yes, ok for one nite to take pics to say you stayed at a capsule

Here are videos and tv reports posted on youtube.

youtube : news report 9 Hours Capsule Hotel
http://www.youtube.com/watch?v=CRT4dU6r -KQ

youtube : 9 Hours Capsule Hotel
http://www.youtube.com/watch?v=OvE3kdFf MLU

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Osaka - Maruichi
http://www.maruichi-hotel.com/room.html (scroll down for japanese room, 3rd green tab has bathrooms)
Style : Japanese room
Location : close to osaka and umeda stations, exit M14 to the large underground shopping
mall. have to ask for directions when you first arrive. Osaka circle line, airport line,
kyoto/kobe/nara lines all stop here
Nightlife : somewhat of a nightlife area but didnt explore much
Room : sliding doors and floor bed, flat screen tv with 10 japanese channels
Clothing : kimono and slippers provided
Bathing : communal showers and hot tub, no sauna
Clientele : families, business travellers, tourists
Gender : both sexes
Food : self serve western breakfast
Storage : small entrance with sliding doors seperates room to store luggage and leave shoes
Power outlet : outlets in room
Language : reception usually speaks good english
Extras : pay per view porn
Pros : good location, breakfast included, quiet
Cons : bathing room is separated by genders at different hours so be sure to check schedule
Recommend : yes, I'll stay again if I get good rates

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Overall best hotel - Tokyo Shinjuku capsule as if you hadnt guessed already!