Fantastic place just a 5 minute walk from Kasai Station. It matched the description to the letter and it's staffed so you can ask questions and they're pretty responsive.
Nice fridge with freezer, cooker, IH, kettle, TV, Washing Machine etc...
Locations is crazy good 7-11 2 minutes walk, Coco Curry 3 minutes walk, other fantastic restaurants max 5 minutes walk.
Beds were fantastic just to my preference, so much so I mistakenly woke up one morning thinking I was home. But that depends on person to person.
One thing to watch out for is the Tozai Line, it is very crowded during all times so be prepared for that. But it's also a insanely good line in terms of connections, you can easily get anywhere.
A huge benefit of Kasai itself is that it has an Airport bus shuttle, and many other busses from the Station to both Haneda and Narita so if you have big bags, no need to switch multiple trains or ride in crowded Tozai line.