Jay's place is bright, fresh and big. We had lots of room to spread out and the place looked almost exactly like the photos. It was quite cold with the thin walls and light curtains but the heater did well to warm the place up in a few hours each night though the extra doona helped. I imagine it would be lovely in spring! The kitchen is clean and has what you need to make basic meals and there's a Family Mart, 7/11, small local supermarket and big shopping centre nearby. The pocket wifi provided was fantastic and lasted us all day easily, though we did turn it off when not using it for extended periods.
It's a bit of a trek from the two nearest JR stations when you have luggage with you and very hard to find if you don't have wifi on your way there. Look up the address and work out your exact route, down to which exit to take from the station, beforehand. It's also at the top of 5 flights of stairs with a tricky little entrance, especially in the rain with 15kgs of luggage each. The walk is easy enough when you don't have your bags.
Only other cons were that the bed was a bit hard for our taste and that the curtains block out none of the light so you're really up with the dawn each day, which is fine if you're an early riser anyway but not great if you want a lie in. Also, the kitchen tap only works when the hot-tap in the bathroom is on.
We had a lovely stay, if you enjoy a minimalist approach to travel and a quiet place out of the main noisy areas, this is the place for you!