I stayed for over a month at Kei's place. At the beginning we were two guests and the space was just right. I spent the last days alone, and after folding the second futon/couch the apartment became a really confortable place to stay! It is equipped with everything you may need to cook your own meals and I recommend walking past the konbinis and visiting the well-stocked supermarkets in the area!
There are two very convenient train stations within walking distance (three, if you want to walk a bit further), and even a large Daiso. The location was perfect to visit the Ikebukuro Station area, which is only 20 minutes away on foot through nice and quiet residential alleys. There's no need to even take the train.
The neighborhood is very quiet, but there are restaurants and even karaokes within a 10-minute walk, just search the area surrounding "Itabashi Station" on your map and you will find them.
Definitely would stay here again!