Originally Posted by
O Sora
Your best choice is to get off at Ginza to transfer to Marunouchi Line. The bus stop at Ginza is very close to Ginza Station, and the Marunouchi line station is located on level B2, while other subways are on deeper levels.
http://accessnarita.jp/en/busstop/
You can access Marunouchi line Ginza station platform taking two elevators from the ground level.
http://www.tokyometro.jp/station/ginza/yardmap/
Follow on the map the red line indicating the barrier-free route. You can take the first elevator from somewhere in front of the Nishi Ginza Department Store.
I don't recommend Tokyo Staion to transfer at in your case.
Thanks for this useful info, which unfortunately I didn't get in time, so I did the transfer at Tokyo Station. I'll try the transfer at Ginza Station going back, but it wasn't too bad at the Tokyo Station.
The airport bus drops off at the Yaesu South side, which is outside the JR Tokyo Station. The main thing to figure out is that from there, just go inside the JR Tokyo Station and find your way through the North Passage, which will lead you to to the main Tokyo Station (with a beautifully renovated retro main lobby).
From there, just step outside to find an elevator to take down a level, in order to transfer to the Tokyo Metro, including the Marunouchi Line. There are elevators and escalators the whole way, so no issue with suitcases.