We stayed at Kaz's place for 4 nights. We're a family of 4 (two kids under 10). The place was great. It was spotless and equipped with plenty of blankets and pillows. The wifi was fast and Kaz was a great communicator before and during our stay. The home was very spacious - we've moved on to Kyoto now, and our new place feels like a shoebox.
Kaz's place is located really close to the Oshiage/Skytree metro stop and the large Skytree mall (with lots of restaurants, etc.). The neighborhood is very quiet - sometimes you forget you're in Tokyo.
Be prepared that this is definitely a rental unit. There were all the necessities (paper towels, laundry soap, shampoo, body wash, conditioner, etc.) but the kitchen does not have any spices, condiments, etc. That wasn't a big deal for us because we didn't cook anything, but something to be aware of if you expect that. There is a 7-11 about 50 steps away though.
Overall, if we find ourself in Tokyo again soon, we will definitely stay here again.