Yuka's place is close to JR Shinagawa station but the nearest metro station is at JR Shimbashi which is a station after Shinagawa. If you plan to travel by metro, you would need to transfer from JR to metro at Shimbashi station.
Yuka's place would be a little small for a large group. Not recommended for people with knee problems as the stairs is quite steep for frequent climbing. Our trash piled up after our 6-nights stay as we are not allowed to dump the trash by ourselves.
The pillow is too soft but we loved the tatami rooms. Only portable wifi was given and the wifi can be slow when everyone is using it at the same time.
On a side note, everything is as accurate as the photos. Yuka responded quickly to my inquiries and speaks fluent english. I would recommend Yuka's place to someone who is looking for a true Japanese homestay.