7. So far I have never took any taxi in Japan. Here's a hotel which I stayed before which I felt is cheap (around 10000 yen), clean and good.6. To have an idea where u can go, click on these links.
http://www.japan-guide.com/
http://wikitravel.org/en/Tokyo
Personally I have been on round island rail trips around Jap 3 times in the past couple of years so feel free to ask any questions. =)
From airport, take Keisei Main Line to UENO (1060Yen), then from UENO, take the JR Yamanote line from UENO to OSAKI. The hotel is a short stroll to the JR OSAKI station. There is a direct overhead bridge which links the train station to a building and the hotel is connected to that building. In that building, there's Saboten, Mos Burger etc etc...and 24 hour convenience store...so its sheltered and convenient.
http://www.daiwaroynet.jp/english/osaki/