As described - this room is a cellar, it’s under the street path and the bathroom is inside the above hotel. My advise is to wear ear plugs then you can’t hear the street noise.
The sheets were clean, the mattes ok, the room is cold and the heater doesn’t really warm the room but there are blankets which keep you sufficiently warm.
The cellar is worn, shows signs of wear and tear and isn’t spotless.
The bathroom is tiny and I mean tiny, I’m 5”9 and a slim build and I struggled to get showered and changed in the small plastic pod that has a shower and toilet.
This room is ideal for a one night sleep if you’re not looking for luxury.
It’s really easy to get to from Kings cross.
The biggest issue for me was that there is no signal so you can’t get online without stepping out of the room.