We genuinely couldn't have found a better place to stay for our first week in Japan. It's far enough away from the hustle and bustle of Shinjuku and Asakusa that you don't feel overwhelmed, but it's close enough to both and all of the other major sites that it will take 20 minutes by subway at the most.
The apartment is clean, well-kept and full of everything you'll need for a long or short stay.
Harumi was really helpful the whole time we were there, especially with letting us know the best way to get to hers after a late flight arrival.
Couldn't recommend it more!