Higashi-Nihombashi - Bakuroyokoyama

Hi again guys!
I am trying to find out the best way from Narita to our apartment at Sninjuku (close to Shinjuku-Sanchome station). Google maps says that we have to transfer from the Asakusa Line to the Shinjuku line at Higashi-Hihombashi station to Bakuroyokoyama Station. It says that it will take just 3 minutes to walk. But I am sceptical about that. It seems to be about 300 m walking. My questions are:
1. Do we have to go uppstairs or is there any underground access?
2. Can you advise us another more convinient way to go to Shinjuku- Sanchome?
Regards.

Via those stns enough if NOT in weekday morning or evening rush peak hrs.

Stn map : original without directions
http://www.kotsu.metro.tokyo.jp/subway/stations/higashi-nihombashi/sol...
Stn map : with directions
https://s17.postimg.org/xqrniz4zj/higashi_nihombashi.png
http://www.ecomo-rakuraku.jp/stationmap/22919.html (with JR line)

Vid fr Asakusa line No.2(not No.1) to Shinjuku line No.1
https://youtu.be/w4VKD88v7OM
No need purchasing a new ticket for Shinjuku line
if use PASMO/Suica(IC card ticket) or discount Subway Pass or not
bc here is one of special transfering rule stn "within 30 min via orange colored gate" like this.
http://static.panoramio.com/photos/large/104331041.jpg
http://cdn-ak.f.st-hatena.com/images/fotolife/l/labeneko/20110605/2011...

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