The place is in a good location--near 2 train stations and if you don't want to walk that far, there's also a bus stop that's nearer and can also bring you to Shinjuku station.
Kasha's place was nice overall--all the necessary amenities are there (except for a washer--there's a laundromat nearby) and the whole place was clean. The place is also near convenience stores and some restaurants.
If you're visiting during Sakura season, this place is near a part of Kanda River. Definitely recommended to walk there to snap some beautiful photos.
Kasha was very easy to talk to. She was fast to respond and her pdf guide was really helpful. Check in and check out was also a breeze.
If you're a big group, expect the space to be bit small but that's common to Tokyo properties. The place however for me is best for couples. If you're a party of 3 or more, while there is a loft to accommodate guests #3 and above, the climb to the loft is a bit tough especially for large people.
Please do take note as well that the building has no elevator so expect to carry your luggage up to the 5th floor.