In general, this was a decent place to crash after spending all day exploring London. It was overall clean and had a bed large enough for the two of us with a relatively clean, though very small, bathroom (the door needed to stay open to ventilate after showering, there were obvious moisture issues in ours). It's a tight space, but functional and reasonably priced given the great location near Tube access and Soho. The location was probably the best aspect by far - Pubs, restaurants, clubs, Tube access, the British Museum, groceries, all within easy walking distance.
Two possibly significant caveats: first, there is neither air conditioning nor electric fans (ceiling-mounted or otherwise). We arrived on a day where the temperature was in the high 80s (*F). The room we had, and one other on our floor (2nd), bake in the sun all day. Additionally, the entry/kitchen area joining the rooms was constantly hot, as if someone had either just run a cleaning cycle on the oven or the heat was on. Long story short, our room was easily into the 90s when we arrived, even after opening both windows fully - very little circulation. Had the weather not dropped back into the low 70s, I doubt we could've spent a week sleeping in that heat. As it was, we ended up sleeping the whole week without any blankets over us anyway due to the residual heat in the building. I understand London doesn't get many days that are that hot, but it's something to consider if you're there in the Summer. Conversely, I could easily see it being very cold in the Fall and Winter months due to the poor window insulation.
Second, and worse, was the noise. Noise from the street and surrounding construction was constant, especially after dark - whether it was the nightly 23:00 garbage/recycling pickups, speeding cars (mind you this is a tight two-lane road on a mixed residential/light commercial street), or loud pub/club/restaurant patrons returning home, there was always something happening. Construction was everywhere too, most notably on the building immediately adjacent to this one, resuming daily around 06:00. Again, the windows are awful providing no sound insulation at all. The listing doesn't promise a quiet room, but if you're a light sleeper you're going to have a bad time staying here. Even I, a very heavy sleeper, was woken multiple times at night and in the very early morning by these things.
Overall, except for the heat and noise, it was a decent stay for us just needing a place to sleep and wash up. I think the other reviews are mostly accurate based on our experience. Don't go in expecting hotel-quality accommodations and absolutely do bring your ear plugs.