Apartment is good size, lots of storage, clean. The house is extremely functional. Everything just work out perfectly. The storage was just fantastic, the bed was good, the drying balcony was convenient to dry your clothes while you are out. It is a place good enough to return to after a full day out.
Something to improve - the kitchen utensils perhaps due to be replaced with new ones. Bathroom is quite cold as no heater, perhaps a small heater would help. But shower was good, strong pressure hot water. Otherwise perfect. It is not modernly furnished, but adequate.
Location is simply great. About a leisure 10 min walk to JR station and 3 min to a subway. We loved the 10 min walk because we will be walking by the shops you dont feel like you have walked 10 min. Just one stop to Shinjuku station where you can take trains to mt fuji etc
For muslims, a lot of halal places along that 10 min walk to JR Shin Okubo station. The halal food were not so great but not bad neither, but a few of them to choose from. There is a vege/fish shop just undeneath the apartment which makes it reallt convenient too.
Owner of cookie house is also very responsive to all questions. Very helpful, infact helped us do one dinner reservation for us.
Great stay.
Note : We love the halal kebab along ameyoko street at Ueno, true to its tag, its the best kebab we had. We also love the north indian restaurant just in front of shinjuku nishigushi station.