What a great find! It was perfect for us, as we wanted somewhere fairly close to Haneda airport, and Oimachi made perfect sense. The apartment is less than 5 minutes walk from the train station. It's down a narrow residential alley so check the pictures first or you might miss it. The check-in process was super easy and the host was friendly and helpful as we were late for our check-in time. The room was quiet and clean, with all amenities we'd need. It was quite cold (it IS winter right now), and the heater wasn't quite powerful enough for us, but after a while it warmed up.
The area around the apartment is filled with konbini, amazing restaurants (we ate at Fuwari and Maruhachi Tonkatsu, which were both incredible) and great bars.
The price is super good as well, especially with such excellent connections into the rest of Tokyo. Thank for a wonderful stay!