Hotels in Japan are always safe and clean, (but the rooms are small in some cases).
The following hotel information is just showing web site of hotels that are not far from Tokyo Tech.. We do not have any contract and agreement with those hotels.
Please reserve rooms by yourself.
http://www.miyakohotels.ne.jp/tokyo/english/index.html
http://www.princejapan.com/GrandPrinceHotelTakanawa/index.asp
http://www.princehotelsjapan.com/shinagawaprincehotel/
http://www.pacific-tokyo.com/eng/
http://www.megurogajoen.co.jp/english/index.html
http://www.princess-garden.co.jp/
http://www.toyoko-inn.com/e_hotel/00029/index.html
http://www.toyoko-inn.com/e_hotel/00001/index.html
http://www.toyoko-inn.com/e_hotel/00146/index.html
http://www.toyoko-inn.com/e_hotel/00004/index.html
http://www.toyoko-inn.com/e_hotel/00020/index.html