The space is exactly as described and in a very convenient place. We came during the acclaimed Sakura Festival and the location is near a lot of the more beautiful parks and wonderful restaurants. The neighborhood is quiet and easy to navigate with lots of restaurants and groceries.
We were traveling with 3 and it's a bit tight for this space, but you can definitely make it work. With just a single or couple, it would have been perfect, especially for the price in Tokyo!