Had a great time staying at Aya's place - just a few mins from Higashi-Nakano station (super convenient as it's only 2 stops from Shinjuku). The entire building and accomodation are clean and modern, and communication between the host was fast and efficient. Our group of 3 found the size alright but keep in mind if you have multiple large luggages space might be a problem. Amenities such as pocket wifi, toiletries, and washing machine were all appreciated as well!