If you have heavy luggages and would like to ship them to your room or airport. UIse for Yamato Transport or Yamato Takkyubin. https://www.kuronekoyamato.co.jp/ytc/en/
Ship to this office and you can pick your luggage there. They keep your luggage for 3 days.
One of their office is just 5 min. walk. 2-3-11 Iwado Minami, Komae 東京都狛江市岩戸南２－３－１１
https://locations.kuronekoyamato.co.jp/p/yamato01/dtl/133022/?&cond21=1&cond22=1&&his=zw,nm&srchplace=35.6240583,139.5935667
If you use your room address to ship your luggages, you should wait until they will be delivered to your room for your signiture. You can not receive your luggages without your signiture. But if you use Yamato office address, you can receive any time in 3 days. They open 7 days a week 9:00-21:00!
WIFI
In Tokyo free wifi is difficult to find and finding someone who can help you in English can be rare. I wouldn't recommend relying on free wifi to help you find Komae station. When you land at the airport in Tokyo fortunately there is tourist wifi available but if you don't prepare in advance the apartment address and train route then this can make arriving very stressful for you and for the staff waiting to meet you at Komae station.
Free Wifi can be found at Shinjuku station and also at the tourist centre at Shibuya station.
To help with sightseeing I recommend buying a tourist internet data sim card. This can be found at a vending machine at the airport and also at large electronic appliance stories such as 'BIC Camera' in Shinjuku, Shibuya etc.
Rent Mobile WiFi or Simi Card in Tokyo