Katsuo's space is very stylish loft that was comfortable and cozy. We had a great time staying there.
Location wise, it's about a mile from Shinagawa Station. There is a closer line that is not JR (I forget the name) but we used mostly JR lines because of our JR pass. In the morning/afternoon we would walk to Shinagawa Station which took about 10 minutes. We ended up taking a cab a couple times from the station (because it was late and cold, plus we had a lot of items we were lugging around) which ended up costing under 700 yen so it was not a problem. A good landmark to show the cabs was dominoe's pizza which was around the corner from Katsuo's home.
Around Katsuo's place is a lot of cafe's, restaurants, and convenience stores. It was very nice and I will come back again.