Host: DoMo is a small agency so it is actually a group of people that 'hosts' you. However, most of my booking with dealt with by Shan who was quick to respond and helpful. However because DoMo manages a number of properties, the service is a bit less personalised than I've previously experienced with other Airbnb providers. They were also not as flexible on check-in time (I was trying for an hour or two earlier but that wasn't possible).
Place: definitely a bit of a squeeze for 3 adults. Probably comfortable for 2 but the beds are quite small and I fell off once. Relatively new (built after July 2014) but due to the quality of the materials used, it is starting to show signs of wear and tear and age. Toilet / vanity / bathroom is pretty much all together so less flexible in usage. Otherwise the place is fine as a basic Airbnb place. I do wish they used thicker / block-out blinds though as there is no way you could try sleeping in due to the sun hitting the room.
Location: quite central as it is only about 10-15 min walk to Shinjuku station, but I do find the west side of Shinjuku station less convenient compared to the east side (we almost always go to the east side, but not that many things are on the west side). There is a single Tokyo metro line station (red Marunochi line) about 5 min walk away. All in all, the Shinjuku location is excellent for Tokyo and the other points are relatively minor inconveniences overall.