Flat has a spacious bedroom / living area with a stunning view. Bathroom is Japanese sized, but also Japanese tech - which means it's excellent.
It is near 3 useful metro stations and located on a cool strip of restaurants, bars, cafes (including care cafes!) and karaoke. Takadanobaba has great Ramen, and the ippudo ramen on the corner of the street was open until late and served up good stuff.
Would recommend this as a good base for exploring Tokyo. However, we were pleasantly surprised by just how much the local area of Takadanobaba has to offer too.
Kaoru was also very helpful and easy to communicate with. We didn't meet him, but he came across through messages as a very pleasant chap.
Only downside to the apartment is that it lacks a bit of soul in its decoration, but when in Tokyo you'll find plenty of soul elsewhere :)