The apartment was very cool, a very smart use of the space and beautiful -- it felt like something we could have designed ourselves. Everything was clean and accounted for, and entry to the apartment was very easy and smooth.
Location-wise, it felt like we were out with 'the locals' -- close enough to Shibuya that it was convenient to go out and pop back after shopping, etc, but not so close that there were crowds or tourists or anything you'd maybe want to avoid if you're looking for a low key visit to Tokyo (not an easy thing to do).
The host was very responsive to any questions we had, and felt easily available to us if there had been any urgent need.