We really enjoyed our stay in this apartment. Its very roomy and the beds are comfy, particularly in the room with four singles. Perfect for families.
It's near a post office and Sunshine City. Ideally it would have been nicer to be closer to the Metro or train lines because by the end of a long day of walking our 6 yr old was tired! But there are many lines to choose from.
Sato communicated really well with us and we had no troubles finding of accessing the apartment and nearby trains. There's a washer/dryer, but we hung most of our clothes. The dryer isn't that efficient.
It was a bit chilly when we were there. I couldn't figure out if there was a heater that could be turned on. Also, there's a cabinet above the kitchen sink that's pretty low. I must have whacked my head about three times. I'm not that tall (5'8"), but this is Japan so things are proportioned lower.
Tips: Walk into lower floor of the BIC camera near Ikebukuro station and show your passport to purchase discounted value combination Metro and Toei passes. We got 72 hr passes for Yen1500 adult and yen 800 child. They sell 48hr and 24hr as well.