Search Tokyo Table Tennis Club (東京卓球倶楽部) in Google Maps and head there. When you arrive, you'll see a narrow alley directly across from the club. Turn into that alley.
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Walk straight to the end of the alley.
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Turn right at the end.
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You'll see a staircase on your left. Go up the stairs.
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Your room is at the top. The lockbox with the key is on the door. The code will be sent to you the day before check-in.