Exsaison Sugamo is an excellent accommodation for longer stays in Tokyo. It has all the amenities a traveler might need, such as multiple towels, a desk and television, coin operated laundry on site, and fast internet access. If you are two travelers, be aware that the rooms are smaller than usual western hotel rooms, with the bed taking up most of the floor space.
It is located close to Sugamo station, where it connects to the Yamanote and Mita lines, making it very convenient for getting down to Ikebukuro/Shinjuku/Shibuya or Tokyo/Ueno/Ginza.
In the neighborhood are a 24 hour grocery store (Seiyu) and plenty of izakayas and shokudos. Jizo dori is nearby for a walking street for some touristic activities.