For the price of the hotel, this is a great hotel in Tokyo. Clean room, decent size for Tokyo, yes the old building rooms are a bit older but still in good condition, they've got everything you need. Free internet and free bottled water from reception. Staff on reception speak a decent level of English. Breakfast if included with the room is ok, but not worth paying the 995 yen for if not. The western breakfast was cold most mornings!
Within 10 mins walking distance to the busy Roppongi and served well by 2 subway stations. Hotel can be a little tricky to find in the dark when you arrive, easiest way to spot it is look for the side street closest to the steak restaurant with a moustache sign!
Would definately recommend to stay here if you are planning on exploring Tokyo.