Mitsuko's place is in a really nice location, just off the main shopping street of Hatagaya. The location is a fairly quiet residential area which is populated by a lot of families and elderly. I think if travellers had small kids it'd be a good area to consider as it's family orientated and there is a nice park nearby. It's just a short walk to the station where you can catch trains or buses close by to major areas like Shinjuku,Shibuya and Nakano.
The host was very easy to communicate with and I always felt like she was there if I needed anything. Check-in was easy and we were able to arrange to store our bags in advance of check-in which was a big help. The space was clean and instructions were left on how to use appliances,when to take out trash,etc. There is a fridge/freezer,microwave and kettle plus cooking appliances in a small kitchen area,bed,sofa bed,TV,large wardobe with vacuum and cleaning products,extra bedding. There is no washing machine but there is a coin laundry a few doors away so it was easy to do laundry. There are many shops,bars and restaurants on the shopping street if you need anything.
This is one of the nicer places I've stayed in Japan and one of the bigger apartments. It's not huge, but in Tokyo you won't get much bigger for the price so I think it is good value in that respect. The bathroom is very small though and no separate toilet so I think this place is not great for tall people. I think a couple or small family group would really enjoy this place but single travellers looking for a place with extra room for storage can consider this too.