Sayoko's place is perfect if you wish to explore Tokyo (2 private & 1 JR station within 15 min walking) or anywhere else in Japan by Shinkansen (Shinagawa Shinkansen station is 1 stop from Osaki Station). The apartment comes with most of the needed amenities such as a washing machine, a pocket wifi (almost unlimited GB but not the most stable), a nice shower & bath, a good hairdryer and a LAWSON on 1 min walking distance. Overall the communication went smoothly. Sayoko is a really nice host, she even received our online ordered packages while we were away and dropped us off at the airport shuttle busstop.
The only min points would be that the room was a bit dusty at arrival (however quickly solved by Sayoko), the slightly thin walls (& slightly loud neighbour) and the occasional shag/weed smell in the hallway (probably also the neighbour).
Definitely a recommendation!