if u fly to haneda, if u ok to stay kawasaki, there is a nikko hotel, 4 star.
sorry i nvr stay there b4, ever got plan, but i not really sure abt e size, it seem stated like 14-18m square, u try and let me noe is gd or not, haha.
pice below 150sgd, get a coach tfrm haneda to e kawaski station, 15min and back to haneda oso easy.
i been to kawasaki cos i roam ard e red light district, dun worry, it still quite a walking distance frm e hotel, if u dun roam too far.
there is a mall there, normally those big town will have mall and have local/express train stop.
well, to access e ring, one way is to get to shbuya, but most attraction is still very accessible like e south, central, west area..