We stayed a little over a week at Nana's guesthouse and it was a really great stay ! The building is a 2-minute walk away from Otsuka station which is on the Yamanote line that goes all around Tokyo so it was really convenient to move around. There are several convenience stores and restaurants nearby and the walk to Ikebukuro's main streets is about 20 minutes long. Nana was a great host ! She even came to get us at the Station to show us the way to the accomodation and then gave us all the information we needed. The appartement is shared with other people but it's an all female one. There are two bathrooms, two kitchens and one living room shared with everyone else. Everything is neat and clean as there are rules to follow for everyone living there. Everyone we met there was very kind. All in all it was an awesome stay and I definitely recommend it to anyone who wants to have a comfy and cheap stay in Tokyo !