Isao's place is in a fantastic location that is very easy to get to the nearest station and from there to the rest of Tokyo. Our flight to Tokyo was delayed and we didn't check in until 2AM but very thankfully Isao stayed up for us, which we really, really appreciated. Kami-itabashi was an awesome place to stay, and would love to go back again, highly recommend this location.
Literally the one issue I had was that if you're tall, you will smack your head a lot on the short doorways, as I did countless times.