Perfect place for a short stay if you are travelling light. The room is very small, but tidy and has everything you might need. The self check-in and check-out are incredibly convenient and easy to use. There are plenty of nice cafes in the area.
There are a few flights of very steep stairs to beware of, and ~15 min walking distance to the tube/Kings X, if you have a suitcase. The location is great; however, some street noise - people and traffic - is especially evident during the night, but I won't say it was much of a problem. Soundproofing is not too ideal either: you can clearly hear anyone leaving or entering their room on both floors. The bathroom is shared between 3 guests, so is expectedly not squeaky clean.
All in all, it's a good deal for the price, is close to Kings X, has exceptionally convenient check-in, and will be great for anyone travelling through London.