There are a few hotels around the University of Tokyo but many hotels in Tokyo.
You can find a hotel, which is close to one of the stations of the same subway lines as the station getting to the University of Tokyo (Hongo campus).
Subway stations getting to the Hongo campus are
Hongo-sanchome (E08 or M21), Todaimae (N12) or Nezu (C14) of this subway map.



[1] Hotel list
A list of several hotels can be found below.
The detail information, for example, the location by Google map, can be also found in Booking.com(Hotel 3,4,5,6,7,8,9) or/and Tripadvisor (Hotel 1,2).

Nearby hotels (we can come to HC2012 by walking or subway.)

No.	Hotel name	location	time by walking		per night
			to Univ.	to nearby station
Hotel 1	Forest Hongo	Hongo	5 min.	10 min.(Hongo-sanchome E08/M21) 5 min.(Todaimae N12)	~12,000 Yen
Hotel 2	Ueno Hotel Park Side	Ueno	15 min.	6 min.(Ueno) 1 min.(Yushima C13)	single ~10,000 Yen twin ~14,000 Yen
Hotel 3	Hotel Kizankan	Hongo	10 min.	2 min.(Hongo-sanchome E08/M21)	~8,500 Yen
Hotel 4	Ueno Terminal Hotel	Ueno	20 min.	2 min.(Ueno)	~10,000 Yen
Hotel 5	Ueno First City Hotel	Ueno	15 min.	10 min.(Ueno) 1 min.(Yushima C13) 5 min.(Okachimachi)	~8,500 Yen
Hotel 6	Tokyo Garden Palace	Ochanomizu	25 min.	5 min.(Ochanomizu)	~10,000 Yen
Hotel 7	Ochanomizu St.Hills Hotel	Ochanomizu	25 min.	5 min.(Ochanomizu) 5 min.(Yushima C13)	~9,500 Yen

Other hotels (we need to take a subway.)

No.	Hotel name	location	subway info	per night
Hotel 8	Hotel JAL City Yotsuya Tokyo	Yotsuya	1 min. to Yotsuya-sanchome (M11)	~8,500 Yen
Hotel 9	Hotel Monterey HANZOMON	Hanzomon	1 min. to Honzomon (Z05), then change subway at Otemachi (Z08 to M18)	~8,500 Yen

Note that if you'll use subway in the morning, probably you will experience the famous "rush-hour" in Tokyo.

[2] Web site to reserve Hotel
Booking.com
Tripadvisor

Station name (to the Univ. of Tokyo)	Subway line	Famous stations/cites
Hongo-sanchome(M21)	Marunouchi Line	Ochanomizu(M20), Ikebukuro(M25), Otemachi(M18), Tokyo(M17), Shinjuku(M08)
Hongo-sanchome(E08)	Oedo Line	Shinjuku-nishiguchi(E01), Ueno-okachimachi(E09)
Todaimae(N12)	Tozai Line	Komagome(N14), Korakuen(N11)
Nezu(C14)	Chiyoda Line	Yushima(C13), Shin-ochanomizu(C12), Kita-senju(C18), Omote-sando(C04)

[3] A tower shown in our poster: Tokyo skytree (height 634m)
You can visit this tower now.
The web site is available here.
The subway station is "Oshiage (SKYTREE)" (Z14 or A20).

Other travel information can be found here.